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Ramanzin, Maurizio; Párraga Aguado, María Ángeles; Ferragina, Alessandro; Sturaro, Enrico; Semenzato, Paola; Serrano, Emmanuel; Clauss, Marcus; Albanell, Elena; Cassini, Rudi; Bittante, Giovanni (2017). Methodological considerations for the use of faecal nitrogen to assess diet quality in ungulates: The Alpine ibex as a case study. Ecological Indicators, 82:399-408.

Klisch, Karl; Carisch, Lea; Clauss, Marcus (2017). Relationship between placental surface area and fetal growth rate in artiodactyls and perissodactyls. Mammalia, 81(4):411-413.

Weary, Taylor E; Wrangham, Richard W; Clauss, Marcus (2017). Applying wet sieving fecal particle size measurement to frugivores: A case study of the eastern chimpanzee (Pan troglodytes schweinfurthii). American Journal of Physical Anthropology, 163(3):510-518.

Frei, Samuel; Ortmann, Sylvia; Kreuzer, Michael; Hatt, Jean-Michel; Clauss, Marcus (2017). Digesta retention patterns in geese (Anser anser) and turkeys (Meleagris gallopavo) and deduced function of avian caeca. Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 204:219-227.

Clauss, Marcus; Fritz, J; Tschuor, A; Braun, Ueli; Hummel, J; Codron, D (2017). Dry matter and digesta particle size gradients along the goat digestive tract on grass and browse diets. Journal of Animal Physiology and Animal Nutrition, 101:61-69.

Clauss, Marcus; Hatt, Jean-Michel (2017). Evidence-based rabbit housing and nutrition. The Veterinary Clinics of North America. Exotic Animal Practice, 20(3):871-884.

Matsuda, Ikki; Clauss, Marcus; Tuuga, Augustine; Sugau, John; Hanya, Goro; Yumoto, Takakazu; Bernard, Henry; Hummel, Jürgen (2017). Factors Affecting Leaf Selection by Foregut-fermenting Proboscis Monkeys: New Insight from in vitro Digestibility and Toughness of Leaves. Scientific Reports, 7:42774.

Heck, Laura; Clauss, Marcus; Sánchez-Villagra, Marcelo R (2017). Gestation length variation in domesticated horses and its relation to breed and body size diversity. Mammalian Biology - Zeitschrift für Säugetierkunde, 84:44-51.

Tahas, Stamatios A; Martin Jurado, O; Hammer, S; Arif, A; Reese, S; Hatt, J M; Clauss, Marcus (2017). Gross Measurements of the Digestive Tract and Visceral Organs of Addax Antelope (Addax nasomaculatus) Following a Concentrate or Forage Feeding Regime. Anatomia, Histologia, Embryologia, 46(3):282-293.

Pérez, William; Lima, Martin; Büker, Markus; Clauss, Marcus (2017). Gross anatomy of the stomach and intestine of an Antarctic minke whale (Balaenoptera bonaerensis). Mammalia, 81(1):111-113.

Balsiger, Annina; Clauss, Marcus; Liesegang, Annette; Dobenecker, B; Hatt, Jean-Michel (2017). Guinea pig (Cavia porcellus) drinking preferences: do nipple drinkers compensate for behaviourally deficient diets? Journal of Animal Physiology and Animal Nutrition, 101(5):1046-1056.

Dittmann, Marie T; Kreuzer, Michael; Runge, Ullrich; Clauss, Marcus (2017). Ingestive mastication in horses resembles rumination but not ingestive mastication in cattle and camels. Journal of Experimental Zoology. Part A, Ecological and Integrative Physiology, 327(2-3):98-109.

Gillis-Germitsch, Nina; Vybiral, Pamela-Rose; Codron, Daryl; Clauss, Marcus; Kotze, Antoinette; Mitchell, Emily P (2017). Intrinsic factors, adrenal gland morphology, and disease burden in captive cheetahs (Acinonyx jubatus) in South Africa. Zoo Biology, 36(1):40-49.

Richard, Olivia K; Codron, Daryl; Hagen, Katharina B; Südekum, Karl-Heinz; Clauss, Marcus (2017). Little differences in digestive efficiency for protein and fat in mammals of different trophic guilds and digestive strategies: data constraints or fundamental functional similarity? Journal of Animal Physiology and Animal Nutrition, 101(Supp 1):127-141.

Vendl, Catharina; Munn, Adam; Leggett, Keith; Clauss, Marcus (2017). Merycism in western grey ( Macropus fuliginosus ) and red kangaroos ( Macropus rufus ). Mammalian Biology - Zeitschrift für Säugetierkunde, 86:21-26.

Clauss, Marcus; Hummel, Jürgen (2017). Physiological adaptations of ruminants and their potential relevance for production systems. Revista Brasileira de Zootecnia, 46(7):606-613.

Matsuda, Ikki; Chapman, Colin A; Shi Physilia, Chua Ying; Mun Sha, John Chih; Clauss, Marcus (2017). Primate Resting Postures: Constraints by Foregut Fermentation? Physiological and Biochemical Zoology, 90(3):383-391.

Hummel, Jürgen; Hammer, Catrin; Hammer, Sven; Südekum, Karl-Heinz; Müller, Dennis W H; Clauss, Marcus (2017). Retention of solute and particle markers in the digestive tract of captive Somali wild asses (Equus africanus somaliensis). European Journal of Wildlife Research, 63(2):41.

Sauer, C; Clauss, Marcus; Bertelsen, M F; Weisbjerg, M R; Lund, P (2017). Rumen content stratification in the giraffe (Giraffa camelopardalis). Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 203:69-76.

Carisch, Lea; Müller, Dennis W H; Hatt, Jean-Michel; Bingaman Lackey, Laurie; Rensch, E Eberhard; Clauss, Marcus; Zerbe, Philipp (2017). Seasonal mortality in zoo ruminants. Zoo Biology, 36(1):74-86.

Schiffmann, Christian; Clauss, Marcus; Hoby, Stefan; Hatt, Jean-Michel (2017). Visual body condition scoring in zoo animals – composite, algorithm and overview approaches. Journal of Zoo and Aquarium Research, 5:1-10.

Clauss, Marcus (2016). Linking authorship and reviewing activity in science publishing. Journal of Brief Ideas:online.

Kaiser, Thomas M; Clauss, Marcus; Schulz-Kornas, Ellen (2016). A set of hypotheses on tribology of mammalian herbivore teeth. Surface Topography: Metrology and Properties, 4(1):014003.

Grandl, F; Luzi, S P; Furger, M; Zeitz, J O; Leiber, F; Ortmann, S; Clauss, Marcus; Kreuzer, M; Schwarm, A (2016). Biological implications of longevity in dairy cows: 1. Changes in feed intake, feeding behavior, and digestion with age. Journal of Dairy Science, 99(5):3457-3471.

Grandl, F; Amelchanka, Sergej L; Furger, M; Clauss, Marcus; Zeitz, Johanna O; Kreuzer, M; Schwarm, A (2016). Biological implications of longevity in dairy cows: 2. Changes in methane emissions and efficiency with age. Journal of Dairy Science, 99(5):3472-3485.

Heidegger, Eva M; von Houwald, Friederike; Steck, Beatrice; Clauss, Marcus (2016). Body condition scoring system for greater one-horned rhino (Rhinoceros unicornis): Development and application. Zoo Biology, 35(5):432-443.

Clauss, Marcus; Lischke, Andreas; Botha, Heike; Hatt, Jean-Michel (2016). Carcass consumption by domestic rabbits (Oryctolagus cuniculus). European Journal of Wildlife Research, 62(1):143-145.

Dudley, Joseph P; Hang'Ombe, Bernard Mudenda; Leendertz, Fabian H; Dorward, Leejiah J; de Castro, Julio; Subalusky, Amanda L; Clauss, Marcus (2016). Carnivory in the common hippopotamus Hippopotamus amphibius: implications for the ecology and epidemiology of anthrax in African landscapes. Mammal Review, 46(3):191-203.

Tidière, Morgane; Gaillard, Jean-Michel; Berger, Vérane; Müller, Dennis W H; Bingaman Lackey, Laurie; Gimenez, Olivier; Clauss, Marcus; Lemaître, Jean-François (2016). Comparative analyses of longevity and senescence reveal variable survival benefits of living in zoos across mammals. Scientific Reports, 6:36361.

Taylor, L A; Müller, D W H; Schwitzer, C; Kaiser, T M; Castell, J C; Clauss, Marcus; Schulz-Kornas, E (2016). Comparative analyses of tooth wear in free-ranging and captive wild equids. Equine Veterinary Journal, 48(2):240-245.

Meier, Andrea R; Schmuck, Ute; Meloro, Carlo; Clauss, Marcus; Hofmann, Reinhold R (2016). Convergence of macroscopic tongue anatomy in ruminants and scaling relationships with body mass or tongue length. Journal of Morphology, 277(3):351-362.

Vendl, Catharina; Frei, Samuel; Dittmann, M T; Furrer, S; Osmann, Christine; Ortmann, Sylvia; Munn, A; Kreuzer, M; Clauss, Marcus (2016). Digestive physiology, metabolism and methane production of captive Linné's two-toed sloths (Choloepus didactylus). Journal of Animal Physiology and Animal Nutrition, 100(3):552-564.

Argyriou, Thodoris; Clauss, Marcus; Maxwell, Erin E; Furrer, Heinz; Sánchez-Villagra, Marcelo R (2016). Exceptional preservation reveals gastrointestinal anatomy and evolution in early actinopterygian fishes. Scientific Reports, 6:online.

Jerbi, Hassen; Bayoudh, Mohamed; Clauss, Marcus; Pérez, William (2016). Gross anatomy of the stomach of the dorcas gazelle (Gazella Dorcas, Linnaeus, 1758). International Journal of Morphology, 34(4):1266-1270.

McGrosky, Amanda; Navarrete, Ana; Isler, Karin; Langer, Peter; Clauss, Marcus (2016). Gross intestinal morphometry and allometry in Carnivora. European Journal of Wildlife Research, 62(4):395-405.

Dittmann, Marie T; Hammond, Kirsty J; Kirton, Paul; Humphries, David J; Crompton, Les A; Ortmann, Sylvia; Misselbrook, Tom H; Südekum, Karl-Heinz; Schwarm, Angela; Kreuzer, Michael; Reynolds, Christopher K; Clauss, Marcus (2016). Influence of ruminal methane on digesta retention and digestive physiology in non-lactating dairy cattle. The British Journal of Nutrition, 116(5):763-773.

Pérez, William; König, Horst Erich; Jerbi, Hassen; Clauss, Marcus (2016). Macroanatomical aspects of the gastrointestinal tract of the alpaca (Vicugna pacos Linnaeus, 1758) and dromedary (Camelus dromedarius Linnaeus, 1758). Vertebrate Zoology, 66(3):419-425.

Sauer, Cathrine; Bertelsen, Mads F; Hammer, Sven; Lund, Peter; Weisbjerg, Martin R; Clauss, Marcus (2016). Macroscopic digestive tract anatomy of two small antelopes, the blackbuck (Antilope cervicapra) and the Arabian sand gazelle (Gazella subgutturosa marica). Anatomia, Histologia, Embryologia, 45(5):392-398.

Wyss, Fabia; Müller, Jacqueline; Clauss, Marcus; Kircher, Patrick R; Geyer, Hans; von Rechenberg, Brigitte; Hatt, Jean-Michel (2016). Measuring rabbit (Oryctolagus cuniculus) tooth growth and eruption by fluorescence markers and bur marks. Journal of Veterinary Dentistry, 33(1):39-46.

Karme, A; Rannikko, J; Kallonen, A; Clauss, Marcus; Fortelius, Mikael (2016). Mechanical modelling of tooth wear. Journal of the Royal Society Interface, 13:20160399.

Vendl, Catharina; Frei, Samuel; Dittmann, Marie Theres; Furrer, Samuel; Ortmann, Sylvia; Lawrenz, Arne; Lange, Bastian; Munn, Adam; Kreuzer, Michael; Clauss, Marcus (2016). Methane production by two non-ruminant foregut-fermenting herbivores: The collared peccary (Pecari tajacu) and the pygmy hippopotamus (Hexaprotodon liberiensis). Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 191:107-114.

Duggan, Graham; Burn, Charlotte C; Clauss, Marcus (2016). Nocturnal behavior in captive giraffe (Giraffa camelopardalis) - A pilot study. Zoo Biology, 35(1):14-18.

Laube, Alexandra; Pendl, Helene; Clauss, Marcus; Altherr, Barblin; Hatt, J M (2016). Plasma biochemistry and hematology reference values of captive Panther chameleons (Furcifer pardalis) with special emphasis on seasonality and gender differences. Journal of Zoo and Wildlife Medicine, 47(3):743-753.

Sauer, C; Bertelsen, M F; Lund, P; Weisbjerg, M R; Clauss, Marcus (2016). Quantitative macroscopic anatomy of the giraffe (giraffa camelopardalis) digestive tract. Anatomia, Histologia, Embryologia, 45(5):338-349.

Sauer, C; Hammer, C; Bertelsen, M F; Tütken, Thomas; Clauss, Marcus; Hammer, S (2016). Quantitative macroscopic digestive tract anatomy of the beira (Dorcatragus megalotis). Journal of Zoo and Aquarium Research, 4:174-179.

Hagen, K B; Dittmann, M T; Ortmann, S; Kreuzer, M; Hatt, J M; Clauss, Marcus (2016). Retention of solute and particle markers in the digestive tract of chinchillas (Chinchilla laniger). Journal of Animal Physiology and Animal Nutrition, 100:801-806.

Gerstner, Kerstin; Liesegang, Annette; Hatt, Jean-Michel; Clauss, Marcus; Galeffi, Cordula (2016). Seasonal body mass changes and feed intake in spectacled bears (Tremarctos ornatus) at Zurich Zoological Garden. Journal of Zoo and Aquarium Research, 4(3):121-126.

Baker, Edward J C; Clauss, Marcus; Clements, Kendall D (2016). Selection and intake of algal species in butterfish (Odax pullus; Labridae). Marine Biology, 163(6):136.

Clark, Amelia; Silva-Fletcher, Ayona; Fox, Mark; Kreuzer, Michael; Clauss, Marcus (2016). Survey of feeding practices, body condition and faeces consistency in captive ant-eating mammals in the UK. Journal of Zoo and Aquarium Research, 4:183-195.

Clauss, Marcus; Stewart, Mathew; Price, Elizabeth; Peilon, Alice; Savage, Tom; Van Ekris, Irene; Munn, Adam (2016). The effect of feed intake on digesta passage, digestive organ fill and mass, and digesta dry matter content in sheep (Ovis aries): Flexibility in digestion but not in water reabsorption. Small Ruminant Research, 138:12-19.

Hatt, J M; Clauss, Marcus (2016). Tierärztliche Betreuung von Greifvögeln: Entwicklungen im Zeitraum von 1985 bis 2015. Schweizer Archiv für Tierheilkunde, 158:639-645.

Zeitz, J O; Ineichen, S; Soliva, C R; Leiber, F; Tschuor, A; Braun, Ueli; Kreuzer, M; Clauss, Marcus (2016). Variability in microbial population and fermentation traits at various sites within the forestomach and along the digestive tract as assessed in goats fed either grass or browse. Small Ruminant Research, 136:7-17.

Codron, D; Codron, J; Sponheimer, M; Clauss, Marcus (2016). Within-population isotopic niche variability in savanna mammals: disparity between carnivores and herbivores. Frontiers in Ecology and Evolution, 4:15.

Gerstner, Kerstin; Liesegang, Annette; Hatt, Jean-Michel; Clauss, Marcus; Galeffi, C (2015). Saisonale Unterschiede in Körpergewicht und Futteraufnahme von Brillenbären (Tremarctos ornatus). In: Kreuzer, M; Lanzini, T; Liesegang, Annette; Bruckmaier, R; Hess, H D. Gesunde und leistungsfähige Nutztiere: Futter an Genotyp oder Genotyp an Futter anpassen?; Tagungsbericht, 13. Mai 2015. Zürich: Eidgenössische Technische Hochschule Zürich (ETH), 191-193.

Frei, Samuel; Ortmann, Sylvia; Reutlinger, Christoph; Kreuzer, Michael; Hatt, Jean-Michel; Clauss, Marcus (2015). Comparative digesta retention patterns in ratites. The Auk, 132(1):119-131.

Frei, Samuel; Hatt, Jean-Michel; Ortmann, Sylvia; Kreuzer, Michael; Clauss, Marcus (2015). Comparative methane emission by ratites: Differences in food intake and digesta retention level out methane production. Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 188:70-75.

Munn, Adam; Stewart, Mathew; Price, Elizabeth; Peilon, Alice; Savage, Tom; Van Ekris, Irene; Clauss, Marcus (2015). Comparison of gut fill in sheep (Ovisaries) measured by intake, digestibility, and digesta retention compared with measurements at harvest. Canadian Journal of Zoology, 93(10):747-753.

Vendl, C; Clauss, Marcus; Stewart, M; Leggett, K; Hummel, J; Kreuzer, M; Munn, A (2015). Decreasing methane yield with increasing food intake keeps daily methane emissions constant in two foregut fermenting marsupials, the western grey kangaroo and red kangaroo. Journal of Experimental Biology, 218(21):3425-3434.

Dittmann, Marie T; Hummel, Jürgen; Hammer, Sven; Arif, Abdi; Hebel, Christiana; Müller, Dennis W H; Fritz, Julia; Steuer, Patrick; Schwarm, Angela; Kreuzer, Michael; Clauss, Marcus (2015). Digesta kinetics in gazelles in comparison to other ruminants: Evidence for taxon-specific rumen fluid throughput to adjust digesta washing to the natural diet. Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 185:58-68.

Dittmann, Marie T; Runge, Ullrich; Ortmann, Sylvia; Lang, Richard A; Moser, Dario; Galeffi, Cordula; Schwarm, Angela; Kreuzer, Michael; Clauss, Marcus (2015). Digesta retention patterns of solute and different-sized particles in camelids compared with ruminants and other foregut fermenters. Journal of Comparative Physiology B, 185(5):559-573.

Gull, J M; Stahl, M; Osmann, C; Ortmann, S; Kreuzer, M; Hatt, J-M; Clauss, Marcus (2015). Digestive physiology of captive giant anteaters (Myrmecophaga tridactyla): determinants of faecal dry matter content. Journal of Animal Physiology and Animal Nutrition, 99(3):565-576.

Hagen, Katharina B; Besselmann, Dorothea; Cyrus-Eulenberger, Ulrike; Vendl, Catharina; Ortmann, Sylvia; Zingg, Robert; Kienzle, Ellen; Kreuzer, Michael; Hatt, J M; Clauss, Marcus (2015). Digestive physiology of the plains viscacha (Lagostomus maximus): A large herbivorous hystricomorph rodent. Zoo Biology, 34(4):345-359.

Tidière, Morgane; Gaillard, Jean-Michel; Müller, Dennis W H; Lackey, Laurie Bingaman; Gimenez, Olivier; Clauss, Marcus; Lemaître, Jean-François (2015). Does sexual selection shape sex differences in longevity and senescence patterns across vertebrates? A review and new insights from captive ruminants. Evolution, 69(12):3123-3140.

Meloro, Carlo; Clauss, Marcus; Raia, Pasquale (2015). Ecomorphology of Carnivora challenges convergent evolution. Organisms Diversity & Evolution, 15(4):711-720.

Matsuda, Ikki; Sha, John C M; Ortmann, Sylvia; Schwarm, Angela; Grandl, Florian; Caton, Judith; Jens, Warner; Kreuzer, Michael; Marlena, Diana; Hagen, Katharina B; Clauss, Marcus (2015). Excretion patterns of solute and different-sized particle passage markers in foregut-fermenting proboscis monkey (Nasalis larvatus) do not indicate an adaptation for rumination. Physiology and Behavior, 149:45-52.

Clauss, Marcus; Steuer, Patrick; Erlinghagen-Lückerath, Kerstin; Kaandorp, Jacques; Fritz, Julia; Südekum, Karl-Heinz; Hummel, Jürgen (2015). Faecal particle size: Digestive physiology meets herbivore diversity. Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 179:182-191.

Gálvez-Cerón, A; Gassó, D; López-Olvera, J R; Mentaberre, G; Bartolomé, J; Marco, I; Ferrer, D; Rossi, L; Garel, M; Lavín, S; Clauss, Marcus; Serrano, E (2015). Gastrointestinal nematodes and dietary fibre: Two factors to consider when using FN for wildlife nutrition monitoring. Ecological Indicators, 52:161-169.

Dittmann, Marie T; Hebel, Christiana; Arif, Abdi; Kreuzer, Michael; Clauss, Marcus (2015). Metabolic rates of three gazelle species (Nanger soemmerringii, Gazella gazella, Gazella spekei) adapted to arid habitats. Mammalian Biology - Zeitschrift für Säugetierkunde, 80(5):390-394.

Frei, Samuel; Dittmann, Marie T; Reutlinger, Christoph; Ortmann, Sylvia; Hatt, J M; Kreuzer, Michael; Clauss, Marcus (2015). Methane emission by adult ostriches (Struthio camelus). Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 180:1-5.

Hagen, Katharina B; Tschudin, A; Liesegang, A; Hatt, J M; Clauss, Marcus (2015). Organic matter and macromineral digestibility in domestic rabbits (Oryctolagus cuniculus) as compared to other hindgut fermenters. Journal of Animal Physiology and Animal Nutrition, 99(6):1197-1209.

Hummel, Jürgen; Hammer, Sven; Hammer, Catrin; Ruf, Julia; Lechenne, Monique; Clauss, Marcus (2015). Solute and particle retention in a small grazing antelope, the blackbuck (Antilope cervicapra). Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 182:22-26.

Hagen, Katharina; Müller, D W H; Wibbelt, Gudrun; Ochs, Andreas; Hatt, J M; Clauss, Marcus (2015). The macroscopic intestinal anatomy of a lowland tapir (Tapirus terrestris). European Journal of Wildlife Research, 61(1):171-176.

Müller, J; Clauss, Marcus; Codron, D; Schulz, E; Hummel, J; Kircher, Patrick; Hatt, Jean-Michel (2015). Tooth length and incisal wear and growth in guinea pigs (Cavia porcellus) fed diets of different abrasiveness. Journal of Animal Physiology and Animal Nutrition, 99(3):591-604.

Hagen, Katharina; Espie, Ian; Lane, Emily P; Kotze, Antoinette; Clauss, Marcus; Codron, D (2014). Mortality and diseases in greater flamingo (Phoenicopterus roseus) and Carribean flamingo (Phoenicopterus ruber) kept at the National Zoological Garderns of South Africa. In: International Conference on Diseases of Zoo and Wild Animals, Warshaw, Poland, 28 May 2014 - 31 May 2014, 57-64.

Clauss, Marcus; Hatt, J M (2014). Nutritional diseases: From bottle feeding to geriatric issues. In: International Conference on Diseases of Zoo and Wild Animals, Warshaw, Poland, 28 May 2014 - 31 May 2014, 83-87.

Dermauw, Veronique; De Cuyper, A; Duchateau, L; Waseyehon, A; Dierenfeld, E; Clauss, Marcus; Peters, I R; Du Laing, G; Janssens, G P J (2014). A disparate trace element metabolism in zebu (Bos indicus) and crossbred (Bos indicus × Bos taurus) cattle in response to a copper-deficient diet. Journal of Animal Science, 92:3007-3017.

Lemaître, Jean-François; Müller, D W H; Clauss, Marcus (2014). A test of the metabolic theory of ecology with two longevity data sets reveals no common cause of scaling in biological times. Mammal Review, 44(3-4):204-214.

Gull, J M; Hebel, Christiana; Arif, Abdi; Deb, A; Clauss, Marcus; Hatt, J M; Hammer, S (2014). Blood values of clinically healthy captive beira antelopes (Dorcatragus megalotis) and during an outbreak of fibrinous pleuropneumonia syndrome (FPPS). Journal of Zoo and Wildlife Medicine, 45(4):735-743.

Lane, Emily P; Clauss, Marcus; Kock, Nancy D; Hill, F W Graham; Majok, Aggrey A; Kotze, Antoinette; Codron, Daryl (2014). Body condition and ruminal morphology responses of free-ranging impala (Aepyceros melampus) to changes in diet. European Journal of Wildlife Research, 60(4):599-612.

Dittmann, Marie T; Hummel, Jürgen; Runge, Ullrich; Galeffi, Cordula; Kreuzer, Michael; Clauss, Marcus (2014). Characterising an artiodactyl family inhabiting arid habitats by its metabolism: Low metabolism and maintenance requirements in camelids. Journal of Arid Environments, 107:41-48.

Matsuda, I; Akiyama, Y; Tuuga, A; Bernard, H; Clauss, Marcus (2014). Daily feeding rhythm in proboscis monkeys: a preliminary comparison with other non-human primates. Primates, 55(2):313-326.

Gattiker, Cristina; Espie, Ian; Kotze, Antoinette; Lane, Emily P; Codron, D; Clauss, Marcus (2014). Diet and diet-related disorders in captive ruminants at the national zoological gardens of South Africa. Zoo Biology, 33(5):426-432.

Steuer, Patrick; Südekum, Karl-Heinz; Tütken, Thomas; Müller, Dennis W H; Kaandorp, Jacques; Bucher, Martin; Clauss, Marcus; Hummel, Jürgen (2014). Does body mass convey a digestive advantage for large herbivores? Functional Ecology, 28(5):1127-1134.

Hagen, Katharina; Clauss, Marcus; Hatt, J M (2014). Drinking preferences in chinchillas (Chinchilla laniger), degus (Octodon degu) and guinea pigs (Cavia porcellus). Journal of Animal Physiology and Animal Nutrition, 98(5):942-947.

Venkataraman, Vivek V; Glowacka, Halszka; Fritz, Julia; Clauss, Marcus; Seyoum, Chalachew; Nguyen, Nga; Fashing, Peter J (2014). Effects of dietary fracture toughness and dental wear on chewing efficiency in geladas (Theropithecus gelada). American Journal of Physical Anthropology, 155(1):17-32.

Dittmann, Marie T; Hebel, Christiana; Hammer, Sven; Hummel, Jürgen; Ortmann, Sylvia; Arif, Abdi; Bouts, Tim; Kreuzer, Michael; Clauss, Marcus (2014). Energy requirements and metabolism of the Phillip's dikdik (Madoqua saltiana phillipsi). Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology, 167:45-51.

Matsuda, I; Tuuga, A; Hashimoto, C; Bernard, H; Yamagiwa, J; Fritz, J; Tsubokawa, K; Yayota, M; Murai, T; Iwata, Y; Clauss, Marcus (2014). Faecal particle size in free‑ranging primates supports a ‘rumination’ strategy in the proboscis monkey (Nasalis larvatus). Oecologia, 174(4):1127-1137.

Carbone, Chris; Codron, D; Scofield, Conrad; Clauss, Marcus; Bielby, Jon (2014). Geometric factors influencing the diet of vertebrate predators in marine and terrestrial environments. Ecology Letters, 17(12):1553-1559.

Müller, Jacqueline; Clauss, Marcus; Codron, Daryl; Schulz, Ellen; Hummel, Jürgen; Fortelius, Mikael; Kircher, Patrick; Hatt, Jean-Michel (2014). Growth and wear of incisor and cheek teeth in domestic rabbits (Oryctolagus cuniculus) fed diets of different abrasiveness. Journal of Experimental Zoology. Part A: Ecological Genetics and Physiology, 321(5):283-298.

Clauss, Marcus; Dittmann, Marie T; Müller, Dennis W H; Zerbe, Philipp; Codron, Daryl (2014). Low scaling of a life history variable: Analysing eutherian gestation periods with and without phylogeny-informed statistics. Mammalian Biology - Zeitschrift für Säugetierkunde, 79(1):9-16.

Tidière, Morgane; Gaillard, Jean-Michel; Müller, Dennis W H; Bingaman Lackey, Laurie; Gimenez, Olivier; Clauss, Marcus; Lemaître, Jean-François (2014). Males do not senesce faster in large herbivores with highly seasonal rut. Experimental Gerontology, 60:167-172.

Dittmann, Marie T; Runge, Ullrich; Lang, Richard A; Moser, Dario; Galeffi, Cordula; Kreuzer, Michael; Clauss, Marcus (2014). Methane Emission by Camelids. PLoS ONE, 9(4):e94363.

Clauss, Marcus; Rössner, G E (2014). Old world ruminant morphophysiology, life history, and fossil record: exploring key innovations of a diversification sequence. Annales Zoologici Fennici, 51:80-94.

Ritz, Julia; Codron, Daryl; Wenger, Sandra; Rensch, Eberhard; Hatt, Jean-Michel; Braun, Ueli; Clauss, Marcus (2014). Ruminal pH in cattle (Bos primigenius f. taurus) and moose (Alces alces) under different feeding conditions: a pilot investigation. Journal of Zoo and Aquarium Research, 2:44-51.

Clauss, Marcus (2014). Soft tissue characteristics for the reconstruction of ruminant phylogeny. Zitteliana, Series B, 32:1-14.

Clauss, Marcus; Hofmann, R R (2014). The digestive system of ruminants, and peculiarities of (wild) cattle. In: Melletti, M; Burton, J. Ecology, evolution and behaviour of wild cattle: implications for conservation. Cambridge: Cambridge University Press, 57-62.

Clauss, Marcus; Schiele, K; Ortmann, S; Fritz, J; Codron, D; Hummel, J; Kienzle, E (2014). The effect of very low food intake on digestive physiology and forage digestibility in horses. Journal of Animal Physiology and Animal Nutrition, 98:107-118.

Taylor, L A; Müller, D W H; Schwitzer, C; Kaiser, T; Codron, D; Schulz, E; Clauss, Marcus (2014). Tooth wear in captive rhinoceroses (Diceros, Rhinoceros, Ceratotherium: Perissodactyla) differs from that of free-ranging conspecifics. Contributions to Zoology, 83:107-117.

Dermauw, Veronique; Lopéz Alonso, Marta; Duchateau, Luc; Du Laing, Gijs; Tolosa, Tadele; Dierenfeld, Ellen; Clauss, Marcus; Janssens, Geert Paul Jules (2014). Trace Element Distribution in Selected Edible Tissues of Zebu (Bos indicus) Cattle Slaughtered at Jimma, SW Ethiopia. PLoS ONE, 9(1):e85300.

Riaz, M Q; Südekum, K-H; Clauss, Marcus; Jayanegara, A (2014). Voluntary feed intake and digestibility of four domestic ruminant species as influenced by dietary constituents: A meta-analysis. Livestock Science, 162:76-85.

Wyss, F; Gull, J; Rothlin, T; Scheiwiler, T; Clauss, Marcus; Hatt, J M (2013). Observations on weight loss and fecal consistency in giant anteaters (Myrmecophaga tridactyla) during three transitions from a mixed natural in-house to commercial complete diets. In: American Association of Zoo Veterinarians, Salt Lake City, Utah, 28 September 2013 - 4 October 2013, 20-23.

Clauss, Marcus (2013). Digestive physiology and feeding behaviour of equids – a comparative approach. In: Horse Health Nutrition - European Equine Health & Nutrition Congress, Gent, Belgium, 1 March 2013 - 2 March 2013, 25-33.

Müller, D W H; Hammer, S; Hammer, C; Hatt, J M; Clauss, Marcus (2013). A conceptual approach to density-dependent management of zoo animals kept in herds. International Zoo Yearbook, 47(1):208-218.

Müller, Dennis W H; Codron, Daryl; Meloro, Carlo; Munn, Adam; Schwarm, Angela; Hummel, Jürgen; Clauss, Marcus (2013). Assessing the Jarman–Bell Principle: Scaling of intake, digestibility, retention time and gut fill with body mass in mammalian herbivores. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 164(1):129-140.

Clauss, Marcus; Dittmann, Marie T; Müller, Dennis W H; Meloro, Carlo; Codron, Daryl (2013). Bergmann′s rule in mammals: a cross-species interspecific pattern. Oikos, 122(10):1465-1472.

Lemaître, Jean-François; Gaillard, Jean-Michel; Lackey, Laurie Bingaman; Clauss, Marcus; Müller, Dennis W H (2013). Comparing free-ranging and captive populations reveals intra-specific variation in aging rates in large herbivores. Experimental Gerontology, 48(2):162-167.

Taylor, Lucy A; Kaiser, Thomas M; Schwitzer, Christoph; Müller, Dennis W H; Codron, Daryl; Clauss, Marcus; Schulz, Ellen (2013). Detecting inter-cusp and inter-tooth wear patterns in rhinocerotids. PLoS ONE, 8(12):e80921.

Schulz, Ellen; Piotrowski, Vanessa; Clauss, Marcus; Mau, Marcus; Merceron, Gildas; Kaiser, Thomas M (2013). Dietary abrasiveness is associated with variability of microwear and dental surface texture in rabbits. PLoS ONE, 8(2):e56167.

Codron, Daryl; Carbone, Chris; Clauss, Marcus (2013). Ecological interactions in dinosaur communities: Influences of small offspring and complex ontogenetic life histories. PLoS ONE, 8(10):e77110.

Codron, D; Carbone, C; Müller, D W H; Clauss, Marcus (2013). Ecological modelling, size distributions and taphonomic size bias in dinosaur faunas: reply to Brown et al. Biology Letters, 9(1):20120922.

Seebacher, Frank; Munn, Adam J; Dunne, Craig; Müller, Dennis W H; Clauss, Marcus (2013). Energy in-equivalence in australian marsupials: evidence for disruption of the continent’s mammal assemblage, or are rules meant to be broken? PLoS ONE, 8(2):e57449.

Wyss, F; Wenker, C; Hoby, S; Gardelli, B; Studer-Thiersch, A; von Houwald, F; Schumacher, V; Clauss, Marcus; Doherr, M G; Häfeli, W; Furrer, S; Béchet, A; Robert, N (2013). Factors influencing the onset and progression of pododermatitis in captive flamingos (Phoenicopteridae). Schweizer Archiv für Tierheilkunde, 155(9):497-503.

Taylor, L A; Schwitzer, C; Owen-Smith, Norman; Kreuzer, M; Clauss, Marcus (2013). Feeding practices for captive greater kudus (Tragelaphus strepsiceros) in UK collections as compared to diets of free-ranging specimens. Journal of Zoo and Aquarium Research, 1(1):7-13.

Steuer, Patrick; Südekum, Karl-Heinz; Müller, Dennis W H; Kaandorp, Jacques; Clauss, Marcus; Hummel, Jürgen (2013). Fibre digestibility in large herbivores as related to digestion type and body mass — An in vitro approach. Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology, 164(2):319-326.

Ritz, J; Hofer, K; Hofer, E; Hackländer, K; Immekus, D; Codron, D; Clauss, Marcus (2013). Forestomach pH in hunted roe deer (Capreolus capreolus) in relation to forestomach region, time of measurement and supplemental feeding and comparison among wild ruminant species. European Journal of Wildlife Research, 59(4):505-517.

Clauss, Marcus; Steuer, Patrick; Müller, Dennis W H; Codron, Daryl; Hummel, Jürgen (2013). Herbivory and body size: Allometries of diet quality and gastrointestinal physiology, and implications for herbivore ecology and dinosaur gigantism. PLoS ONE, 8(10):e68714.

Kaiser, Thomas M; Müller, Dennis W H; Fortelius, Mikael; Schulz, Ellen; Codron, D; Clauss, Marcus (2013). Hypsodonty and tooth facet development in relation to diet and habitat in herbivorous ungulates: implications for understanding tooth wear. Mammal Review, 43(1):34-46.

Schwarm, Angela; Ortmann, Sylvia; Fritz, Julia; Flach, Edmund; Rietschel, Wolfram; Clauss, Marcus (2013). No distinct stratification of ingesta particles and no distinct moisture gradient in the fore-stomach of non-ruminants: The wallaby, peccary, hippopotamus, and sloth. Mammalian Biology - Zeitschrift für Säugetierkunde, 78(6):412-421.

Lauper, Murielle; Lechner, Isabel; Barboza, Perry S; Collins, William B; Hummel, Jürgen; Codron, Daryl; Clauss, Marcus (2013). Rumination of different-sized particles in muskoxen (Ovibos moschatus) and moose (Alces alces) on grass and browse diets, and implications for rumination in different ruminant feeding types. Mammalian Biology - Zeitschrift für Säugetierkunde, 78(2):142-152.

Clauss, Marcus; Kohlschein, Gina-Marie; Peemöller, Andreas; Hummel, Jürgen; Hatt, Jean-Michel (2013). Short-term digestible energy intake in captive moose (Alces alces) on different diets. Zoo Biology, 32(5):484-489.

Clauss, Marcus; Müller, D W H; Codron, D (2013). Source references and the scientist's mind-map: Harvard vs. Vancouver style. Journal of Scholarly Publishing, 44(3):274-282.

Codron, Jacqueline; Kirkman, Kevin; Duffy, Kevin J; Sponheimer, Matt; Lee-Thorp, Julia A; Ganswindt, Andre; Clauss, Marcus; Codron, Daryl (2013). Stable isotope turnover and variability in tail hairs of captive and free-ranging African elephants (Loxodonta africana) reveal dietary niche differences within populations. Canadian Journal of Zoology, 91:124-134.

Taylor, L A; Rudd, J; Hummel, J; Clauss, Marcus; Schwitzer, C (2013). Weight loss in pygmy hippos (Choeropsis liberiensis). In: Steck, B. International Studbook for the Year 2012 - Pygmy Hippopotamus. Basel: Zoo Basel, 20-25.

Wyss, F; Wenker, C; Robert, N; Clauss, Marcus; von Houwald, F (2012). Why do Greater one-horned rhinoceroses (Rhinoceros unicornis) die? - An evaluation of necropsy reports. In: International Conference on Diseases of Zoo and Wild Animals, Bussulengo/Verona, Italy, 16 May 2012 - 19 May 2012, 54-61.

Sawada, Akiko; Sakaguchi, Ei; Clauss, Marcus; Hanya, Goro (2012). A pilot study on the ontogeny of digestive physiology in Japanese macaques (Macaca fuscata). Mammalian Biology - Zeitschrift für Säugetierkunde, 77(6):455-458.

Helary, Stephane F; Shaw, Joanne A; Brown, Derek; Clauss, Marcus; Owen-Smith, Norman (2012). Black rhinoceros (diceros bicornis) natural diets: comparing iron levels across seasons and geographical locations. Journal of Zoo and Wildlife Medicine, 43(3s):S48-S54.

Clauss, Marcus (2012). Clinical technique: Feeding hay to rabbits and rodents. Journal of Exotic Pet Medicine, 21(1):80-86.

Fritz, Julia; Streich, W Jürgen; Schwarm, A; Clauss, Marcus (2012). Condensing results of wet sieving analyses into a single data: a comparison of methods for particle size description. Journal of Animal Physiology and Animal Nutrition, 96(5):783-797.

Müller, D W H; Codron, D; Werner, J; Fritz, J; Hummel, J; Griebeler, E M; Clauss, Marcus (2012). Dichotomy of eutherian reproduction and metabolism. Oikos, 121(1):102-115.

Serrano Ferron, E; Verheyden, H; Hummel, J; Cargnelutti, B; Lourtet, B; Merlet, J; González-Candela, M; Angibault, J M; Hewison, A J M; Clauss, Marcus (2012). Digestive plasticity as a response to woodland fragmentation in roe deer. Ecological Research, 27(1):77-82.

Hoby, S; Clauss, Marcus; Aebischer, A; Wenker, C; Robert, N; Liesegang, A (2012). Dry matter and calcium digestibility in captive veiled chameleons (Chamaeleo calyptratus). Journal of Animal Physiology and Animal Nutrition, 96(5):778-782.

Stahl, M; Osmann, C; Ortmann, S; Kreuzer, M; Hatt, J M; Clauss, Marcus (2012). Energy intake for maintenance in a mammal with a low basal metabolism, the giant anteater (Myrmecophaga tridactyla). Journal of Animal Physiology and Animal Nutrition, 96(5):818-824.

Clauss, Marcus; Burger, B; Liesegang, A; Del Chicca, F; Kaufmann-Bart, M; Riond, B; Hässig, M; Hatt, J M (2012). Influence of diet on calcium metabolism, tissue calcification and urinary sludge in rabbits (Oryctolagus cuniculus). Journal of Animal Physiology and Animal Nutrition, 96(5):798-807.

Clauss, Marcus; Dierenfeld, Ellen; Goff, Jesse; Klasing, Kirk; Koutsos, Liz; Lavin, Shana; Livingston, Shannon; Nielson, Brian; Schlegel, Michael; Sullivan, Kathleen; Valdes, Eduardo; Ward, Ann (2012). Iod in rhinos—nutrition group report: report from the nutrition working group of the international workshop on iron overload disorder in browsing rhinoceros (february 2011). Journal of Zoo and Wildlife Medicine, 43(3s):S108-S113.

Clauss, Marcus; Paglia, Donald E (2012). Iron storage disorders in captive wild mammals: the comparative evidence. Journal of Zoo and Wildlife Medicine, 43(3s):S6-S18.

Codron, D; Carbone, C; Müller, D W H; Clauss, Marcus (2012). Ontogenetic niche shifts in dinosaurs influenced size, diversity and extinction in terrestrial vertebrates. Biology Letters, 8(4):620-623.

Meloro, C; Clauss, Marcus (2012). Predator-prey biomass fluctuations in the Plio-Pleistocene. Palaios, 27(2):90-96.

Clauss, Marcus; Hildebrandt, T; Thomé, H; Volmer, K (2012). Prof. Dr. Reinhold R. Hofmann zum 80. Geburtstag. Deutsches Tierärzteblatt, (4):528.

Zerbe, Philipp; Clauss, Marcus; Codron, D; Bingaman Lackey, Laurie; Rensch, Eberhard; Streich, Jürgen W; Hatt, J M; Müller, D W H (2012). Reproductive seasonality in captive wild ruminants: implications for biogeographical adaptation, photoperiodic control, and life history. Biological Reviews, 87(4):965-990.

Munn, A J; Tomlinson, S; Savage, T; Clauss, Marcus (2012). Retention of different-sized particles and derived gut fill estimate in tammar wallabies (Macropus eugenii): Physiological and methodological considerations. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 161(2):243-249.

Fritz, Julia; Hammer, Sven; Hebel, Christiana; Arif, Abdi; Michalke, Bernhard; Dittmann, Marie T; Müller, Dennis W H; Clauss, Marcus (2012). Retention of solutes and different-sized particles in the digestive tract of the ostrich (Struthio camelus massaicus), and a comparison with mammals and reptiles. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 163(1):56-65.

Scientific Writing Experience; Clauss, Marcus; Schmid-Brunclik, N; Wesche, P; Streich, W J; Gassmann, M; Hatt, J M (2012). Serum iron metabolites in an opportunistic sample of different captive primate species. International Zoo Yearbook, 46(1):195-200.

Codron, J; Codron, D; Sponheimer, M; Kirkman, K; Duffy, K J; Raubenheimer, E J; Melice, J-L; Grant, R; Clauss, Marcus; Lee-Thorp, J A (2012). Stable isotope series from elephant ivory reveal lifetime histories of a true dietary generalist. Proceedings of the Royal Society B: Biological Sciences, 279(1737):2433-2441.

Codron, Daryl; Sponheimer, Matt; Codron, Jacqui; Newton, Ian; Lanham, John L; Clauss, Marcus (2012). The confounding effects of source isotopic heterogeneity on consumer–diet and tissue–tissue stable isotope relationships. Oecologia, 169(4):939-953.

Codron, D; Sponheimer, M; Codron, J; Hammer, S; Tschuor, A; Braun, U; Bernasconi, S M; Clauss, Marcus (2012). Tracking the fate of digesta 13C and 15N compositions along the ruminant gastrointestinal tract: Does digestion influence the relationship between diet and faeces? European Journal of Wildlife Research, 58(1):303-313.

Sandmeier, P; Clauss, Marcus; Donati, O F; Chiers, K; Kienzle, E; Hatt, J M (2012). Use of deferiprone for the treatment of hepatic iron storage disease in three hornbills. Journal of the American Veterinary Medical Association, 240(1):75-81.

Ritz, J; Clauss, Marcus; Streich, W J; Hatt, J M (2012). Variation in growth and potentially associated health status in Hermann's and spur-thighed tortoise (Testudo hermanni and Testudo graeca). Zoo Biology, 31(6):705-717.

Hatt, J M; Müller, D W H; Bingaman Lackey, L; Clauss, Marcus (2011). Life expectancy in zoo mammals: what a zoo veterinarian should know. In: Proceedings of the AAZV Conference, Kansas City, Missouri, USA, 23 October 2011 - 28 October 2011, 181-183.

Franz, R; Kreuzer, M; Hummel, J; Hatt, J M; Clauss, Marcus (2011). Intake, selection, digesta retention, digestion and gut fill of two coprophageous species, rabbits (Oryctolagus cuniculus) and guinea pigs (Cavia porcellus), on a hay-only diet. Journal of Animal Physiology and Animal Nutrition, 95(5):564-570.

Clauss, Marcus; Hummel, J (2011). Comparative fibre digestion. In: 15th Congress European Society of Veterinary and Comparative Nutrition, Zaragoza, Spain, 14 September 2011 - 16 September 2011, 9-15.

Franz, R; Soliva, C R; Kreuzer, M; Hummel, J; Clauss, Marcus (2011). Methane output of rabbits (Oryctolagus cuniculus) and guinea pigs (Cavia porcellus) fed a hay-only diet: Implications for the scaling of methane production with body mass in non-ruminant mammalian herbivores. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 158(1):177-181.

Müller, D W H; Zerbe, P; Codron, D; Clauss, Marcus; Hatt, J M (2011). A long life among ruminants: giraffids and other special cases. Schweizer Archiv für Tierheilkunde, 153(11):515-519.

Hummel, J; Findeisen, E; Südekum, K H; Ruf, I; Kaiser, T M; Bucher, M; Clauss, Marcus; Codron, D (2011). Another one bites the dust: faecal silica levels in large herbivores correlate with high-crowned teeth. Proceedings of the Royal Society B: Biological Sciences, 278(1712):1742-1747.

Sander, P M; Christian, A; Clauss, Marcus; Fechner, R; Gee, C T; Griebeler, E M; Gunga, H C; Hummel, J; Mallison, H; Perry, S F; Preuschoft, H; Rauhut, O W M; Remes, K; Tütken, T; Wings, O; Witzel, U (2011). Biology of the sauropod dinosaurs: the evolution of gigantism. Biological Reviews, 86(1):117-155.

Steinmetz, H W; Zingg, R; Ossent, P; Eulenberger, U; Clauss, Marcus; Hatt, J M (2011). Comparison of indoor and captive, free-roaming management in goldenheaded lion tamarins (Leontopithecus chrysomelas) at Zürich Zoo. Animal Welfare, 20(2):205-210.

Schwarm, A; Albrecht, S; Ortmann, S; Wolf, C; Clauss, Marcus (2011). Digesta retention time in roe deer Capreolus capreolus, as measured with cerium-, lanthanum- and chromium-mordanted fibre. European Journal of Wildlife Research, 57(3):437-442.

Codron, D; Hull, J; Brink, J S; Codron, J; Ward, D; Clauss, Marcus (2011). Effect of competition on niche dynamics of syntopic grazing ungulates: contrasting the predictions of habitat selection models using stable isotope analysis. Evolutionary Ecology Research, 13(3):217-235.

Pirovino, M; Heistermann, M; Zimmermann, N; Zingg, R; Clauss, Marcus; Codron, D; Kaup, F J; Steinmetz, H W (2011). Fecal Glucocorticoid Measurements and Their Relation to Rearing, behavior, and environmental factors in the population of pileated gibbons (Hylobates pileatus) held in European zoos. International Journal of Primatology, 32(5):1161-1178.

Neubert, F; Clauss, Marcus (2011). Fehlerfrei Füttern - Notzeitäsung fürs Schalenwild. Wild und Hund, 2011(24):24-27.

Clauss, Marcus; Lunt, N; Ortmann, S; Plowman, A; Codron, D; Hummel, J (2011). Fluid and particle passage in three duiker species. European Journal of Wildlife Research, 57(1):143-148.

Fritz, J; Hummel, J; Kienzle, E; Wings, O; Streich, W J; Clauss, Marcus (2011). Gizzard vs. teeth, it’s a tie: food-processing efficiency in herbivorous birds and mammals and implications for dinosaur feeding strategies. Paleobiology, 37(4):577-586.

Clauss, Marcus; Hatt, J M; Hummel, J (2011). Green grocery guide. Zooquaria, (5):22-23.

Franz, R; Hummel, J; Müller, D W H; Bauert, M; Hatt, J M; Clauss, Marcus (2011). Herbivorous reptiles and body mass: Effects on food intake, digesta retention, digestibility and gut capacity, and a comparison with mammals. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 158(1):94-101.

Müller, D W H; Bingaman Lackey, L; Streich, W J; Fickel, J; Hatt, J M; Clauss, Marcus (2011). How to measure husbandry success? The life expectancy of zoo ruminants. WAZA Magazine, (12):37-39.

Steuer, P; Südekum, K H; Müller, D W H; Franz, R; Kaandorp, J; Clauss, Marcus; Hummel, J (2011). Is there an influence of body mass on digesta mean retention time in herbivores? A comparative study on ungulates. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 160(3):355-364.

Clauss, Marcus; Müller, K; Fickel, J; Streich, W J; Hatt, J M; Südekum, K H (2011). Macroecology of the host determines microecology of endobionts: protozoal faunas vary with wild ruminant feeding type and body mass. Journal of Zoology, 283(3):169-185.

Müller, D W H; Bingaman Lackey, L; Streich, W J; Fickel, J; Hatt, J M; Clauss, Marcus (2011). Mating system, feeding type and ex situ conservation effort determine life expectancy in captive ruminants. Proceedings of the Royal Society B: Biological Sciences, 278:2076-2080.

Franz, R; Soliva, C R; Kreuzer, M; Hatt, J M; Furrer, S; Hummel, J; Clauss, Marcus (2011). Methane output of tortoises: Its contribution to energy loss related to herbivore body mass. PLoS ONE, 6(3):e17628.

Müller, D W H; Caton, J; Codron, D; Schwarm, A; Lentle, R; Streich, W J; Hummel, J; Clauss, Marcus (2011). Phylogenetic constraints on digesta separation: Variation in fluid throughput in the digestive tract in mammalian herbivores. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 160(2):207-220.

Tschudin, A; Clauss, Marcus; Codron, D; Hatt, J M (2011). Preference of rabbits for drinking from open dishes versus nipple drinkers. Veterinary Record, 168(7):190-190a.

Matsuda, I; Murai, T; Clauss, Marcus; Yamada, T; Tuuga, A; Bernard, H; Higashi, S (2011). Regurgitation and remastication in the foregut-fermenting proboscis monkey (Nasalis larvatus). Biology Letters, 7(5):786-789.

Yisehak, K; Becker, A; Belay, D; Bosch, G; Hendriks, W H; Clauss, Marcus; Janssens, G P J (2011). Salivary amino acid concentrations in zebus (Bos indicus) and zebu hybrids (Bos indicus × Bos taurus) fed a tannin-rich diet. Belgian Journal of Zoology, 141(2):93-96.

Clauss, Marcus (2011). Sauropod biology and the evolution of gigantism: what do we know? In: Klein, N; Remes, K; Gee, C T; Sander, P M. Biology of the sauropod dinosaurs. Understanding the life of giants. Bloomington and Indianapolis: Indiana University Press, 3-7.

Hummel, J; Clauss, Marcus (2011). Sauropod feeding and digestive physiology. In: Klein, N; Remes, K; Gee, C T; Sander, P M. Biology of the sauropod dinosaurs. Understanding the life of giants. Bloomington and Indianapolis: Indiana University Press, 11-32.

Hebel, C; Ortmann, S; Hammer, S; Hammer, C; Fritz, J; Hummel, J; Clauss, Marcus (2011). Solute and particle retention in the digestive tract of the Phillip's dikdik (Madoqua saltiana phillipsi), a very small browsing ruminant: Biological and methodological implications. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 159(3):284-290.

Clauss, Marcus; Lechner, I; Barboza, P; Collins, W; Tervoort, T A; Südekum, K H; Codron, D; Hummel, J (2011). The effect of size and density on the mean retention time of particles in the reticulorumen of cattle ( Bos primigenius f. taurus), muskoxen ( Ovibos moschatus) and moose ( Alces alces). British Journal of Nutrition, 105:634-644.

Zerbe, P; Glaus, T M; Clauss, Marcus; Hatt, J M; Steinmetz, H W (2011). Ultrasonographic evaluation of postprandial heart variation in juvenile Paraguay anacondas (Eunectes notaeus). American Journal of Veterinary Research, 72:1253-1258.

Tschudin, A; Clauss, Marcus; Hatt, J M (2011). Umfrage zur Fütterung und Tränke von Kaninchen (Oryctolagus cuniculus) in der Schweiz 2008/2009. Schweizer Archiv für Tierheilkunde, 153(3):134-138.

Zimmermann, N; Pirovino, M; Zingg, R; Clauss, Marcus; Kaup, F J; Heistermann, M; Hatt, J M; Steinmetz, H W (2011). Upper respiratory tract disease in captive orangutans (Pongo sp.): prevalence in 20 European zoos and predisposing factors. Journal of Medical Primatology, 40(6):365-375.

Tschudin, A; Clauss, Marcus; Codron, D; Liesegang, A; Hatt, J M (2011). Water intake in domestic rabbits (Oryctolagus cuniculus) from open dishes and nipple drinkers under different water and feeding regimes. Journal of Animal Physiology and Animal Nutrition, 95(4):499-511.

Codron, D; Codron, J; Sponheimer, M; Bernasconi, S M; Clauss, Marcus (2011). When animals are not quite what they eat: diet digestibility influences 13C-incorporation rates and apparent discrimination in a mixed-feeding herbivore. Canadian Journal of Zoology, 89:453-465.

Janis, C M; Constable, E C; Houpt, K A; Streich, W J; Clauss, Marcus (2010). Comparative ingestive mastication in domestic horses and cattle: a pilot investigation. Journal of Animal Physiology and Animal Nutrition, 94(6):e402-e409.

Clauss, Marcus; Lang-Deuerling, S; Müller, D W H; Kienzle, E; Steuer, P; Hummel, J (2010). Retention of fluid and particles in captive tapirs (Tapirus sp.). Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 157(1):95-101.

Steuer, P; Clauss, Marcus; Südekum, K H; Hatt, Jean-Michel; Silinksi, S; Klomburg, S; Zimmermann, W; Fickel, J; Streich, W J; Hummel, J (2010). Comparative investigations on digestion in grazing (Ceratotherium simum) and browsing (Diceros bicornis) rhinoceroses. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 156(4):380-388.

Schwarm, A; Ortmann, S; Rietschel, W; Kühne, R; Wibbelt, G; Clauss, Marcus (2010). Function, size and form of the gastrointestinal tract of the collared Pecari tajacu (Linnaeus 1758) and white-lipped peccary Tayassu pecari (Link 1795). European Journal of Wildlife Research, 56(4):569-576.

Glogowski, R; Czauderna, M; Rozbicka, A; Krajewska, K A; Clauss, Marcus (2010). Fatty acid profile of hind leg muscle in female and male nutria (Myocastor coypus Mol.), fed green forage diet. Meat Science, 85(3):577-579.

Meyer, K; Hummel, J; Clauss, Marcus (2010). The relationship between forage cell wall content and voluntary food intake in mammalian herbivores. Mammal Review, 40(3):221-245.

Sander, P M; Gee, C T; Hummel, J; Clauss, Marcus (2010). Mesozoic plants and dinosaur herbivory. In: Gee, C T. Plants in Mesozoic time: Morphological innovations, phylogeny, ecosystems. Bloomington: Indiana University Press, 331-359.

Müller, D W H; Müller, S I; Bingaman Lackey, L; Hammer, C; Hammer, S; Leus, K; Maier, M; Hatt, J M; Clauss, Marcus (2010). Less can be more: considering seasonal differences of newborn mortality in breeding regimes. In: Proceedings of the International Conference on Diseases of Zoo and Wild Animals, Madrid, 12 May 2010 - 15 May 2010, 96-98.

Deiss, R; Hammer, C; Müller, D W H; Deb, A; Clauss, Marcus; Hammer, S (2010). Mortality patterns in nondomestic hoofstock (Ovis orientalis laristanica, Capra aegagrus, Capra ibex nubiana) indicate species-specific differences in disease susceptibility in small ruminants. In: Proceedings of the International Conference on Diseases of Zoo and Wild Animals, Madrid, 12 May 2010 - 15 May 2010, 59-66.

Clauss, Marcus; Müller, D W H; Steinmetz, H W; Hatt, J M (2010). The more the merrier or happy when alone? Hypothesis on stress susceptibility in captive individuals of solitary species. In: Proceedings of the International Conference on Diseases of Zoo and Wild Animals, Madrid, 12 May 2010 - 15 May 2010, 92-95.

Clauss, Marcus; Hofmann, R R; Streich, W J; Fickel, J; Hummel, J (2010). Convergence in the macroscopic anatomy of the reticulum in wild ruminant species of different feeding types and a new resulting hypothesis on reticular function. Journal of Zoology, 281(1):26-38.

Kaiser, T M; Fickel, J; Streich, W J; Hummel, J; Clauss, Marcus (2010). Enamel ridge alignment in upper molars of ruminants in relation to their natural diet. Journal of Zoology, 281(1):12-25.

Müller, D W H; Bingaman Lackey, L; Streich, W J; Hatt, J M; Clauss, Marcus (2010). Research Digest: Selected highlight from other veterinary journals - Effect of management and feeding regimes on life expectancy in captive deer. Veterinary Record, 166(17):502.

Clauss, Marcus; Hume, I D; Hummel, J (2010). Evolutionary adaptations of ruminants and their potential relevance for modern production systems. animal, 4(7):979-992.

Seefeldt, S S; Collins, W B; Kuhl, J C; Clauss, Marcus (2010). White Sweetclover (Melilotus albus) and Narrowleaf Hawksbeard (Crepis tectorum)Seed Germination after Passing through Moose. Invasive Plant Science and Management, 3(1):26-31.

Clauss, Marcus (2010). Artgerechte Fütterung der Wildtiere - was ist fachlich vertretbar? In: Buchgraber, K. Wildbewirtschaftung verständlich vermitteln. Schwerpunkt: Fütterung und Abschussplanung. Irdning, Österreich: Lehr- und Forschungsanstalt für Landwirtschaft Raumberg-Gumpenstein, 27-34.

Ritz, J; Griebeler, E M; Huber, R; Clauss, Marcus (2010). Body size development of captive and free-ranging African spurred tortoises (Geochelone sulcata): High plasticity in reptilian growth rates. Herpetological Journal, 20(3):213-216.

Ritz, J; Hammer, C; Clauss, Marcus (2010). Body size development of captive and free-ranging Leopard tortoises (Geochelone pardalis). Zoo Biology, 29:517-525.

Clauss, Marcus; Kleffner, H; Kienzle, E (2010). Carnivorous mammals: nutrient digestibility and energy evaluation. Zoo Biology, 29(6):687-704.

Müller, D W H; Gaillard, J M; Bingaman Lackey, L; Hatt, J M; Clauss, Marcus (2010). Comparing life expectancy of three deer species between captive and wild populations. European Journal of Wildlife Research, 56(2):205-208.

Lechner, I; Barboza, P; Collins, W; Fritz, J; Günther, D; Hattendorf, B; Hummel, J; Südekum, K H; Clauss, Marcus (2010). Differential passage of fluids and different-sized particles in fistulated oxen (Bos primigenius f. taurus), muskoxen (Ovibos moschatus), reindeer (Rangifer tarandus) and moose (Alces alces): Rumen particle size discrimination is independent from contents stratification. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 155 A(2):211-222.

Tschudin, A; Rettmer, H; Watson, R; Clauss, Marcus; Hammer, S (2010). Evaluation of hand-rearing records for Spix’s macaw Cyanopsitta spixii at the Al Wabra Wildlife Preservation from 2005 to 2007. International Zoo Yearbook, 44:201-211.

Franz, R; Soliva, C R; Kreuzer, M; Steuer, P; Hummel, J; Clauss, Marcus (2010). Methane production in relation to body mass of ruminants and equids. Evolutionary Ecology Research, 12:727-738.

Müller, D W H; Bingaman Lackey, L; Streich, W J; Hatt, J M; Clauss, Marcus (2010). Relevance of management and feeding regimens on life expectancy in captive deer. American Journal of Veterinary Research, 71(3):275-280.

Codron, D; Clauss, Marcus (2010). Rumen physiology constrains diet niche: linking digestive physiology and food selection across wild ruminant species. Canadian Journal of Zoology, 88(11):1129-1138.

Clauss, Marcus; Adamczewski, J; Hofmann, R R (2010). Surface enlargement in the rumen of free-ranging muskoxen (Ovibos moschatus). European Journal of Wildlife Research, 56(2):181-185.

Fritz, J; Hummel, J; Kienzle, E; Streich, W J; Clauss, Marcus (2010). To chew or not to chew: fecal particle size in herbivorous reptiles and mammals. Journal of Experimental Zoology. Part A: Ecological Genetics and Physiology, 313A(9):579-586.

Clauss, Marcus; Nunn, C; Fritz, J; Hummel, J (2009). Evidence for a tradeoff between retention time and chewing efficiency in large mammalian herbivores. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 154(3):376-382.

Clauss, Marcus; Keller, A; Peemöller, A; Nygren, K; Hatt, Jean-Michel; Nuss, Karl (2009). Postmortal radiographic diagnosis of laminitis in a captive European moose (Alces alces). Schweizer Archiv für Tierheilkunde, 151(11):545-549.

Kaiser, T M; Brasch, J; Castell, J C; Schulz, E; Clauss, Marcus (2009). Tooth wear in captive wild ruminant species differs from that of free-ranging conspecifics. Mammalian Biology - Zeitschrift für Säugetierkunde, 74(6):425-437.

Langenecker, M; Clauss, Marcus; Hässig, M; Hatt, J M (2009). Vergleichende Untersuchung zur Krankheitsverteilung bei Kaninchen, Meerschweinchen, Ratten und Frettchen. Tierärztliche Praxis. Ausgabe K, Kleintiere, 37(5):326-333.

Schwarm, A; Schweigert, M; Ortmann, S; Hummel, J; Janssens, G P J; Streich, W J; Clauss, Marcus (2009). No easy solution for the fractionation of faecal nitrogen in captive wild herbivores: results of a pilot study. Journal of Animal Physiology and Animal Nutrition, 93(5):596-605.

Lechner, I; Barboza, P; Collins, W; Günther, D; Hattendorf, B; Hummel, J; Clauss, Marcus (2009). No ‘bypass’ in adult ruminants: Passage of fluid ingested vs. fluid inserted into the rumen in fistulated muskoxen (Ovibos moschatus), reindeer (Rangifer tarandus) and moose (Alces alces). Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 154(1):151-156.

Clauss, Marcus; Hofmann, R R; Fickel, J; Streich, W J; Hummel, J (2009). The intraruminal papillation gradient in wild ruminants of different feeding types: implications for rumen physiology. Journal of Morphology, 270(8):929-942.

Ritz, J; Clauss, Marcus (2009). Werden bei Schildkröten die Gesundheit und Fruchtbarkeit durch ein schnelles Wachstum beeinflusst? Untersuchungen zum Wachstum von herbivoren Landschildkröten. Testudo, 18(2):22-27.

Koch, M; Möstl, E; Steinmetz, H W; Clauss, Marcus; Masello, J F; Quillfeldt, P (2009). Non-invasive measurement of faecal glucocorticoid metabolites in Upland Geese Chloephaga picta. Polar Biology, 32(2):281-285.

Müller, D W H; Clauss, Marcus; Borer, S; Hammer, C; Deb, A; Arif, A; Hammer, S (2009). A retrospective analysis of necropsy reports and stock - data of the Soemmerring’s gazelle (Gazella soemmerringii) at Al Wabra Wildlife Preservation (AWWP), Qatar. In: Wibbelt, G; Kretzschmar, P; Hofer, H. Proceedings of the International Conference on Diseases of Zoo and Wild Animals. Berlin: Leibniz Institute for Zoo and Wildlife Research, 279-283.

Franz, R; Hummel, J; Kienzle, E; Kölle, P; Gunga, H C; Clauss, Marcus (2009). Allometry of visceral organs in living amniotes and its implications for sauropod dinosaurs. Proceedings of the Royal Society B: Biological Sciences, 276(1662):1731-1736.

Piening Schuler, Y; Hammer, C; Clauss, Marcus; Hammer, S (2009). Birth seasonality in captive bovids at Al Wabra Wildlife Preservation (AWWP), Qatar. In: Wibbelt, G; Kretzschmar, P; Hofer, H. Proceedings of the International Conference on Diseases of Zoo and Wild Animals. Berlin: Leibniz Institute for Zoo and Wildlife Research, 297-303.

Wenker, C J; Clauss, Marcus; Besselmann, D; Streich, W J; Lutz, H (2009). Changes in body weight, hematology and serum chemistry in captive plains viscachas (Lagostomus maximus) with presumptive diabetes type II after a diet change. Schweizer Archiv für Tierheilkunde, 151(2):61-68.

Hatt, J M; Zollinger, E; Boehler, A; Hofer, M; Steinmetz, H W; Clauss, Marcus (2009). Collection and analysis of breath and breath condensate exhaled by feral pigeons (Columba livia) and chickens (Gallus domesticus). Veterinary Record, 165:469-473.

Fritz, J; Hummel, J; Kienzle, E; Arnold, Christian; Nunn, C; Clauss, Marcus (2009). Comparative chewing efficiency in mammalian herbivores. Oikos, 118:1623-1632.

Wespi, B; Clauss, Marcus; Deb, A; Arif, A; Taha, A; Hammer, C; Hammer, S (2009). Comparison of an unmanaged population of Pelzeln's gazelle. (Gazella dorcas pelzelni) to an intensively managed population at Al Wabra Wildlife Preservation (AWWP), Qatar. In: Wibbelt, G; Kretzschmar, P; Hofer, H. Proceedings of the International Conference on Diseases of Zoo and Wild Animals. Berlin: Leibniz Institute for Zoo and Wildlife Research, 340-344.

Ritz, J; Hammer, C; Clauss, Marcus (2009). Comparison of body size development in captive and free-ranging leopard tortoises (Geochelone pardalis). In: Wibbelt, G; Kretzschmar, P; Hofer, H. Proceedings of the International Conference on Diseases of Zoo and Wild Animals. Berlin: Leibniz Institute for Zoo and Wildlife Research, 28-30.

Clauss, Marcus; Wilkins, T; Hartley, A; Hatt, J M (2009). Diet composition, food intake, body condition, and fecal consistency in captive tapirs (Tapirus spp.) in UK collections. Zoo Biology, 28(4):279-291.

Keller, A; Clauss, Marcus; Muggli, Evelyne; Nuss, Karl (2009). Even-toed but uneven in length: the digits of artiodactyls. Zoology, 112(4):270-278.

Colville, K; Bouts, T; Hartley, A; Clauss, Marcus; Routh, A (2009). Frothy bloat and serous fat atrophy associated with insufficient fibre intake in a giraffe (Giraffa camelopardalis). In: Clauss, M; Fidgett, A; Hatt, J M; Huisman, T; Hummel, J; Janssen, G; Nijboer, J; Plowman, A. Zoo Animal Nutrition, Vol. IV. Fürth: Filander, 219-229.

Pérez, W; Lima, M; Clauss, Marcus (2009). Gross Anatomy of the Intestine in the Giraffe (Giraffa camelopardalis). Anatomia, Histologia, Embryologia: Journal of Veterinary Medicine Series C, 38(6):432-435.

Müller, D W H; Bingaman Lackey, L; Streich, W J; Hatt, J M; Clauss, Marcus (2009). Life expectancy in captive deer: A possibility to evaluate husbandry management in zoos. In: Wibbelt, G; Kretzschmar, P; Hofer, H. Proceedings of the International Conference on Diseases of Zoo and Wild Animals. Berlin: Leibniz Institute for Zoo and Wildlife Research, 47.

Zerbe, P; Schwarz, C; Deb, A; Borjal, R J; Arif, A; Taha, A S; Streich, W J; Clauss, Marcus; Hammer, S (2009). Long-term monitoring of endoparasites in birds-of-paradise at Al Wabra Wildlife Preservation, Doha. International Zoo Yearbook, 43(1):149-158.

Clauss, Marcus; Reese, S; Eulenberger, K (2009). Macroscopic digestive anatomy of a captive lowland anoa (Bubalus depressicornis). In: Clauss, M; Fidgett, A; Hatt, J M; Huisman, T; Hummel, J; Janssen, G; Nijboer, J; Plowman, A. Zoo Animal Nutrition, Vol. IV. Fürth: Filander, 255-263.

Clauss, Marcus; Lang-Deuerling, S; Kienzle, E; Medici, E P; Hummel, J (2009). Mineral absorption in tapirs (Tapirusspp.) as compared to the domestic horse. Journal of Animal Physiology and Animal Nutrition, 93(6):768-776.

Schwarm, A; Ortmann, S; Wolf, C; Streich, W J; Clauss, Marcus (2009). More efficient mastication allows increasing intake without compromising digestibility or necessitating a larger gut: Comparative feeding trials in banteng (Bos javanicus) and pygmy hippopotamus (Hexaprotodon liberiensis). Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 152(4):504-512.

Schwarm, A; Ortmann, S; Wolf, C; Clauss, Marcus (2009). No distinct difference in the excretion of large particles of varying size in a wild ruminant, the banteng (Bos javanicus). European Journal of Wildlife Research, 55(5):531-533.

Gull, J; Steinmetz, H W; Clauss, Marcus; Besselmann, D; Ossent, P; Wenker, C J; Hatt, J M (2009). Occurrence of cataract and fatty liver in captive plains viscachas (Lagostomus maximus) in relation to diet. Journal of Zoo and Wildlife Medicine, 40(4):652-658.

Schwarm, A; Ortmann, S; Wolf, C; Streich, W J; Clauss, Marcus (2009). Passage marker excretion in red kangaroo (Macropus rufus), collared peccary (Pecari tajacu) and colobine monkeys (Colobus angolensis, C. polykomos, Trachypithecus johnii). Journal of Experimental Zoology. Part A: Ecological Genetics and Physiology, 311(9):647-661.

Hummel, J; Südekum, K H; Bayer, D; Ortmann, S; Streich, W J; Hatt, J M; Clauss, Marcus (2009). Physical characteristics of reticuloruminal contents of oxen in relation to forage type and time after feeding. Journal of Animal Physiology and Animal Nutrition, 93(2):209-220.

Clauss, Marcus; Fritz, J; Bayer, D; Nygren, K; Hammer, S; Hatt, J M; Südekum, K H; Hummel, J (2009). Physical characteristics of rumen contents in four large ruminants of different feeding type, the addax (Addax nasomaculatus), bison (Bison bison), red deer (Cervus elaphus) and moose (Alces alces). Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 152(3):398-406.

Clauss, Marcus; Fritz, J; Bayer, D; Hummel, J; Streich, W J; Südekum, K H; Hatt, J M (2009). Physical characteristics of rumen contents in two small ruminants of different feeding type, the mouflon (Ovis ammon musimon) and the roe deer (Capreolus capreolus). Zoology, 112(3):195-205.

Nees, S; Schade, B; Clauss, Marcus; Steinmetz, H W; Ehrensperger, F; Steck, B; Hatt, J M (2009). Polycystic kidney disease in the pygmy hippopotamus (Hexaprotodon liberiensis). Journal of Zoo and Wildlife Medicine, 40(3):529-535.

Clauss, Marcus; Grum, C; Hatt, J M (2009). Polyunsaturated fatty acid content in adipose tissue in foregut and hindgut fermenting mammalian herbivores. A literature survey. Mammalian Biology - Zeitschrift für Säugetierkunde, 74(2):153-158.

Zenker, W; Clauss, Marcus; Huber, J; Altenbrunner-Martinek, B (2009). Rumen pH and hoof health in two groups of captive wild ruminants. In: Clauss, M; Fidgett, A; Hatt, J M; Huisman, T; Hummel, J; Janssen, G; Nijboer, J; Plowman, A. Zoo Animal Nutrition, Vol. IV. Fürth: Filander, 247-254.

Pirovino, M; Zingg, R; Hagen, R; Heistermann, M; Kaup, F J; Clauss, Marcus; Hatt, J M; Steinmetz, H W (2009). The influence of female life history on reproduction in captive pileated gibbons (Hylobates pileatus). In: Wibbelt, G; Kretzschmar, P; Hofer, H. Proceedings of the International Conference on Diseases of Zoo and Wild Animals. Berlin: Leibniz Institute for Zoo and Wildlife Research, 307.

Zerbe, P; Glaus, T M; Clauss, Marcus; Hatt, J M; Steinmetz, H W (2009). Ultrasonographic evaluation of the postprandial heart variation in juvenile Paraguayan anakondas (Eunectes notaeus). In: Wibbelt, G; Kretzschmar, P; Hofer, H. Proceedings of the International Conference on Diseases of Zoo and Wild Animals. Berlin: Leibniz Institute for Zoo and Wildlife Research, 31-32.

Müller, D W H; Hammer, S; Hammer, C; Clauss, Marcus (2009). Up, over the top, or down? Population development in closed captive populations of wild ruminants. In: Wibbelt, G; Kretzschmar, P; Hofer, H. Proceedings of the International Conference on Diseases of Zoo and Wild Animals. Berlin: Leibniz Institute for Zoo and Wildlife Research, 48-50.

Fritsche, R; Simova-Curd, S; Clauss, Marcus; Hatt, J M (2008). Hyperthyroidism in connection with suspected diabetes mellitus in a chinchilla (Chinchilla laniger). Veterinary Record, 163(15):454-456.

Leiber, F; Meier, J S; Burger, B; Wettstein, H R; Kreuzer, M; Hatt, J M; Clauss, Marcus (2008). Significance of coprophagy for the fatty acid profile in body tissues of rabbits fed different diets. Lipids, 43(9):853-865.

Clauss, Marcus; Hummel, J (2008). Getting it out of the (digestive) system : hindgut fermenters and calcium. In: 7th Biennial Symposium of the Comparative Nutrition Society, Liscomb Mills, Nova Scotia , 8 August 2008 - 13 August 2008, 30-36.

Clauss, Marcus; Streich, W J; Nunn, C L; Ortmann, S; Hohmann, G; Schwarm, A; Hummel, J (2008). The influence of natural diet composition, food intake level, and body size on ingesta passage in primates. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 150(3):274-281.

Clauss, Marcus; Dierenfeld, E S; Bigley, K E; Wang, Y; Ghebremeskel, K; Hatt, J M; Flach, E J; Behlert, O; Castell, J C; Streich, W J; Bauer, J E (2008). Fatty acid status in captive and free-ranging black rhinoceroses (Diceros bicornis)*. Journal of Animal Physiology and Animal Nutrition, 92(3):231-241.

Clauss, Marcus; Hammer, S; Deb, A; Knauf, S; Martin Jurado, O; Wenker, C; Hatt, J M (2008). "Zoo research camp 2007" of the Al Wabra Wildlife Preservation and the Vetsuisse Faculty, and "First EAZWV summer school" at Basle Zoo : two approaches to introduce veterinary students to zoo animal medicine. In: 7th Congress of the European Association of Zoo and Wildlife Veterinarians, Leipzig, Germany, 30 April 2008 - 4 May 2008, 77-80.

EAZWV Students; Clauss, Marcus; Martin Jurado, O; Pewsner, M (2008). Evaluation of Okapi (Okapia johnstoni) necropsy reports and studbook data as part of the EAZWV summer school. In: 7th Congress of the European Association of Zoo and Wildlife Veterinarians, Leipzig, Germany, 30 April 2008 - 4 May 2008, 323-327.

Hammer, S; Schwarz, C; Zerbe, P; Deb, A; Borjal, R; Arif, A; Taha, A; Clauss, Marcus (2008). Excessive iron storage in captive birds of paradise at Al Wabra Wildlife Preservation. In: 7th Congress of the European Association of Zoo and Wildlife Veterinarians, Leipzig, Germany, 30 April 2008 - 4 May 2008, 345-348.

Hammer, C; Stutz, K; Deb, A; Arif, A; Taha, A; Clauss, Marcus; Hammer, S (2008). Medical management and pathology of captive Gerenuk (Litocranius walleri) at Al Wabra Wildlife Preservation (AWWP) from 2001 to 2006. In: 7th Congress of the European Association of Zoo and Wildlife Veterinarians, Leipzig, Germany, 30 April 2008 - 4 May 2008, 349-351.

Nagy, A; Gull, J M; Deb, A; Arif, A; Hammer, C; Wernery, U; Clauss, Marcus; Verhoeven, S; Hammer, S (2008). Retrospective evaluation of necropsy reports for Beira Antelopes (Dorcotragus megalotis) at Al Wabra Wildlife Preservation, Qatar - with specieal focus on the occurrence of a fibrinous pleuopneumonia syndrome. In: 7th Congress of the European Association of Zoo and Wildlife Veterinarians, Leipzig, Germany, 30 April 2008 - 3 May 2008, 277-286.

Schwarm, A; Ortmann, S; Wolf, C; Streich, W J; Clauss, Marcus (2008). Excretion patterns of fluid and different sized particle passage markers in banteng (Bos javanicus) and pygmy hippopotamus (Hexaprotodon liberiensis): Two functionally different foregut fermenters. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 150(1):32-39.

Clauss, Marcus; Hummel, J; Schwarm, A; Steuer, P; Fritz, J; Martin Jurado, O; Tschudin, A; Hatt, J M (2008). An isthmus at the caecocolical junction is an anatomical feature of domestic and wild equids. European Journal of Wildlife Research, 54(2):347-351.

Clauss, Marcus; Nijboer, J; Loermans, J H M; Roth, T; van der Kuilen, J; Beynen, A C (2008). Comparative digestion studies in wild suids at Rotterdam Zoo. Zoo Biology, 27(4):305-319.

Hofmann, R R; Streich, W J; Fickel, J; Hummel, J; Clauss, Marcus (2008). Convergent evolution in feeding types: salivary gland mass differences in wild ruminant species. Journal of Morphology, 269(2):240-257.

Hummel, J; Fritz, J; Kienzle, E; Medici, E P; Lang, S; Zimmermann, W; Streich, W J; Clauss, Marcus (2008). Differences in fecal particle size between free-ranging and captive individuals of two browser species. Zoo Biology, 27(1):70-77.

Clauss, Marcus; Aufranc, R; Hatt, J M (2008). Feeding and faeces consistency of South American tapir (Tapirus terrestris) at Zurich Zoo. Zoologische Garten, 77:297-302.

Hummel, J; Steuer, P; Südekum, K H; Hammer, S; Hammer, C; Streich, W J; Clauss, Marcus (2008). Fluid and particle retention in the digestive tract of the addax antelope (Addax nasomaculatus)--adaptations of a grazing desert ruminant. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 149(2):142-149.

Codron, D; Brink, J S; Rossouw, L; Clauss, Marcus; Codron, J; Lee-Thorp, J A; Sponheimer, M (2008). Functional differentiation of african grazing ruminants: an example of specialized adaptations to very small changes in diet. Biological Journal of the Linnean Society, 94(4):755-764.

Wings, O; Hatt, J M; Schwarm, A; Clauss, Marcus (2008). Gastroliths in a pygmy hippopotamus (Hexaprotodon liberiensis MORTON 1844)(Mammalia, Hippopotamidae). Senckenbergiana biologica: International Journal of Biodiversity, 88(2):345-348.

Clauss, Marcus; Hofmann, R R; Streich, W J; Fickel, J; Hummel, J (2008). Higher masseter muscle mass in grazing than in browsing ruminants. Oecologia, 157(3):377-385.

Hummel, J; Gee, C T; Südekum, K H; Sander, P M; Nogge, G; Clauss, Marcus (2008). In vitro digestibility of fern and gymnosperm foliage: implications for sauropod feeding ecology and diet selection. Proceedings of the Royal Society B: Biological Sciences, 275(1638):1015-1021.

Tschuor, A; Clauss, Marcus (2008). Investigations on the stratification of forestomach contents in ruminants : an ultrasonographic approach. European Journal of Wildlife Research, 54(4):627-633.

Martin Jurado, O; Clauss, Marcus; Hatt, J M (2008). Irregular tooth wear and longevity in captive wild ruminants : a pilot survey of necropsy reports. Journal of Zoo and Wildlife Medicine, 39(1):69-75.

Clauss, Marcus (2008). Is there an intrinsic body size constraint in mammalian carnivory - reaction to Carbone et al. (2007) 'The costs of carnivory', part 1. PLoS Biology:Published online.

Besselmann, D; Schaub, D; Wenker, C; Völlm, J; Robert, N; Schelling, C; Steinmetz, H W; Clauss, Marcus (2008). Juvenile mortality in captive Lesser Kudu (Tragelaphus imberbis) at Basle zoo and its relation to nutrition and husbandry. Journal of Zoo and Wildlife Medicine, 39(1):86-91.

Clauss, Marcus; Hummel, J; Streich, W J; Südekum, K H (2008). Mammalian metabolic rate scaling to 2/3 or 3/4 depends on the presence of gut contents. Evolutionary Ecology Research, 10:153-154.

Hummel, J; Clauss, Marcus (2008). Megaherbivores as pacemakers of carnivore diversity and biomass: distributing or sinking trophic energy. Evolutionary Ecology Research, 10:925-930.

Munn, A J; Streich, W J; Hummel, J; Clauss, Marcus (2008). Modelling digestive constraints in non-ruminant and ruminant foregut-fermenting mammals. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 151(1):78-84.

Pérez, W; Clauss, Marcus; Ungerfeld, P (2008). Observations on the macroscopic anatomy of the intestinal tract and its mesenteric folds in the pampas deer (ozotoceros bezoarticus, linnaeus 1758). Anatomia, Histologia, Embryologia: Journal of Veterinary Medicine Series C, 37(4):317-321.

Sander, P M; Clauss, Marcus (2008). Paleontology: Sauropod Gigantism. Sciene, 322(5899):200-201.

Clauss, Marcus; Wittenbrink, M M; Castell, J C; Kienzle, E; Dierenfeld, E S; Flach, E J; Macgregor, S K; Hoppe, T; Hummel, J; Streich, W J; Hatt, J M (2008). Quantification of Enterobacteriaceae in faeces of captive black rhinoceros (Diceros bicornis) in relation to dietary tannin supplementation. Journal of Animal Physiology and Animal Nutrition, 92(1):29-34.

Codron, D; Brink, J S; Rossouw, L; Clauss, Marcus (2008). The evolution of ecological specialization in southern African ungulates: competition- or physical environmental turnover? Oikos, 117(3):344-353.

Clauss, Marcus; Kaiser, T; Hummel, J (2008). The morphophysiological adaptations of browsing and grazing mammals. In: Gordon, I J; et al. The ecology of browsing and grazing. Berlin: Springer, 47-88.

Clauss, Marcus; Dierenfeld, E S (2008). The nutrition of "browsers". In: Fowler, M E; et al; Miller, R E. Zoo and wild animal medicine: current therapy. St. Louis, USA: Saunders Elsevier, 444-454.

Clauss, Marcus; Schwarm, A; Ortmann, S; Streich, W J; Hummel, J (2007). A case of non-scaling in mammalian physiology? Body size, digestive capacity, food intake, and ingesta passage in mammalian herbivores. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 148(2):249-265.

Hammer, S; Jensen, S; Borjal, R; Clauss, Marcus (2007). Bill impaction in a group of captive Caribbean flamingos (Phoenicopterus ruber ruber). Journal of Zoo and Wildlife Medicine, 38(3):465-470.

Clauss, Marcus; Besselmann, D; Schwarm, A; Ortmann, S; Hatt, J M (2007). Demonstrating coprophagy with passage markers? The example of the plains viscacha (Lagostomus maximus). Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 147(2):453-9.

Clauss, Marcus; Firzlaff, U; Castell, J C; Kiefer, B; Streich, W J; Liesegang, A (2007). Effect of captivity and mineral supplementation on body composition and mineral status of mustached bats (Pteronotus parnellii rubiginosus). Journal of Animal Physiology and Animal Nutrition, 91(5-6):187-192.

Clauss, Marcus; Grum, C; Hatt, J M (2007). Fatty acid status of captive wild animals: a review. Zoologische Garten, 76(5-6):382-401.

Clauss, Marcus; Sauter-Louis, C; Kienzle, E (2007). Historical copper and manganese levels in cattle feeds in bavaria, germany. Journal of Nutritional & Environmental Medicine, 16(1):69-74.

van Nijboer, J; Clauss, Marcus; Van de Put, K; van der Kuilen, J; Wouterse, H; Beynen, A C (2007). Influence of two different diets on fluid and particle retention time javan langur (trachypithecus auratus auratus). Zoologische Garten, 77(1):36-46.

Clauss, Marcus; Castell, J C; Kienzle, E; Schramel, P; Dierenfeld, E S; Flach, E J; Behlert, O; Streich, W J; Hummel, J; Hatt, J M (2007). Mineral absorption in the black rhinoceros (Diceros bicornis) as compared with the domestic horse. Journal of Animal Physiology and Animal Nutrition, 91(5-6):193-204.

Clauss, Marcus; Steinmetz, H W; Eulenberger, U; Ossent, P; Zingg, R; Hummel, J; Hatt, J M (2007). Observations on the length of the intestinal tract of African Loxodonta africana (Blumenbach 1797) and Asian elephants Elephas maximus (Linne 1735). European Journal of Wildlife Research, 53(1):68-72.

Steinmetz, H W; Clauss, Marcus; Feige, K; Thio, T; Isenbügel, E; Hatt, J M (2007). Recurrent tongue tip constriction in a captive giant anteater (Myrmecophaga tridactyla). Journal of Zoo and Wildlife Medicine, 38(1):146-149.

Clauss, Marcus; Castell, J C; Kienzle, E; Dierenfeld, E S; Flach, E J; Behlert, O; Ortmann, S; Streich, W J; Hummel, J; Hatt, J M (2007). The influence of dietary tannin supplementation on digestive performance in captive black rhinoceros (Diceros bicornis). Journal of Animal Physiology and Animal Nutrition, 91(11-12):449-458.

Clauss, Marcus; Streich, W J; Schwarm, A; Ortmann, S; Hummel, J (2007). The relationship of food intake and ingesta passage predicts feeding ecology in two different megaherbivore groups. Oikos, 116(2):209-216.

Clauss, Marcus; Franz-Odendaal, T A; Brasch, J; Castell, J C; Kaiser, T (2007). Tooth wear in captive giraffes (Giraffa camelopardalis): mesowear analysis classifies free-ranging specimens as browsers but captive ones as grazers. Journal of Zoo and Wildlife Medicine, 38(3):433-445.

Clauss, Marcus; Hatt, J M; Hummel, J (2006). Fütterung grosser Pflanzenfresser. In: Arbeitstagung der Zootierärzte im deutschsprachigen Raum, Frankfurt, 3 November 2006 - 5 November 2006.

Grabowski, T; Clauss, Marcus (2006). Environmental stress and antler development in captive roe deer (Capreolus capreolus). Four case reports. In: 6th Congress of the European Association of Zoo and Wildlife Veterinarians, Budapest (Hungary), 24 May 2006 - 28 May 2006, 247.

Rose, P; Hummel, J; Clauss, Marcus (2006). Food and calculated energy intake in captive giraffe (Giraffa camelopardalis) in the UK. In: 6th Congress of the European Association of Zoo and Wildlife Veterinarians, Budapest (Hungary), 24 May 2006 - 28 May 2006, 289.

Hummel, J; Zimmermann, W; Langenhorst, T; Schleussner, G; Damen, M; Clauss, Marcus (2006). Giraffe husbandry and feeding practices in Europe. Results of an EEP survey. In: 6th Congress of the European Association of Zoo and Wildlife Veterinarians, Budapest (Hungary), 24 May 2006 - 28 May 2006, 71-74.

Rajaonarisoa, M A H; Rakotozandriny, J; Katz, A; Clauss, Marcus; Hatt, J M (2006). Improving the dietary regime for captive lemurs at ivoloina park by computer-based ration analysis. In: 6th Congress of the European Association of Zoo and Wildlife Veterinarians, Budapest (Hungary), 24 May 2006 - 28 May 2006, 287.

Clauss, Marcus; Rose, P; Hummel, J; Hatt, J M (2006). Serous fat atrophy and other nutrition-related health problems in captive giraffe (Giraffa camelopardalis). An evaluation of 83 necropsy reports. In: 6th Congress of the European Association of Zoo and Wildlife Veterinarians, Budapest (Hungary), 24 May 2006 - 28 May 2006, 233-235.

Kienzle, E; Stürmer, K; Ranz, D; Clauss, Marcus (2006). A high roughage/concentrate ratio decreases the effect of ammonium chloride on acid-base balance in horses. Journal of Nutrition, 136(7 Supp):2048S-2049S.

Clauss, Marcus; Pellegrini, N; Castell, J C; Kienzle, E; Dierenfeld, E S; Hummel, J; Flach, E J; Streich, W J; Hatt, J M (2006). Antioxidant status of faeces of captive black rhinoceros (Diceros bicornis) in relation to dietary tannin supplementation. Journal of Veterinary Medicine Series A, 53(6):319-322.

Hammer, S; Hammer, C; Schulz, J; Wernery, U; Clauss, Marcus (2006). Biochemische Serumparameter bei in Gefangenschaft gehaltenen Gazellen. Tierärztliche Praxis. Ausgabe G, Grosstiere/Nutztiere, 34(3):190-196.

Sauter-Louis, C; Clauss, Marcus; Chaher, E; Klee, W; Wichmann, H E; Kienzle, E (2006). Breed predisposition for BSE: epidemiological evidence in Bavarian cattle. Schweizer Archiv für Tierheilkunde, 148(5):245-250.

Höllerl, S; Stimm, B; Hummel, J; Clauss, Marcus (2006). Browse provision for captive herbivores. Design and management of a browse plantation. In: Fidgett, A; Clauss, M; Eulenberger, K; Hatt, J M; Hume, I; Janssens, G; Nijboer, J. Zoo animal nutrition Vol. III. Fürth: Filander, 211-212.

Hatt, J M; Clauss, Marcus (2006). Browse silage in zoo animal nutrition : feeding enrichment of browsers during winter. In: Fidgett, A; Clauss, M; Eulenberger, K; Hatt, J M; Hume, I; Janssens, G; Nijboer, J. Zoo animal nutrition Vol. III. Fürth: Filander, 201-204.

Nijboer, J; Clauss, Marcus; Nobel, J J L (2006). Browse silage. The solution for browsers in the wintertime? In: Fidgett, A; Clauss, M; Eulenberger, K; Hatt, J M; Hume, I; Janssens, G; Nijboer, J. Zoo animal nutrition Vol. III. Fürth: Filander, 205-209.

Kienzle, E; Kopsch, G; Koelle, P; Clauss, Marcus (2006). Chemical composition of turtles and tortoises. Journal of Nutrition, 136(7 Supp):2053S-2054S.

Zollinger, E; Clauss, Marcus; Steinmetz, H W; Hatt, J M (2006). Collection of exhaled breath and exhaled breath condensate in veterinary medicine. A review. Veterinary Quarterly, 28(3):105-117.

Zulauf-Fischer, I; Liesegang, A; Haessig, M; Clauss, Marcus; Hatt, J M (2006). Differences in bone mineral content and density between male and female budgerigars (Melopsittacus undulatus) during the non-reproductive season. Journal of Veterinary Medicine Series A, 53(9):456-457.

Liesegang, A; Firzlaff, U; Kiefer, B; Streich, W J; Clauss, Marcus (2006). Different supplementation of minerals in bats and the consequences on bone mineral density. In: Fidgett, A; Clauss, M; Eulenberger, K; Hatt, J M; Hume, I; Janssens, G. Zoo animal nutrition Vol. III. Fürth: Filander, 295-300.

Clauss, Marcus; Castell, J C; Kienzle, E; Dierenfeld, E S; Flach, E J; Behlert, O; Ortmann, S; Streich, W J; Hummel, J; Hatt, J M (2006). Digestion coefficients achieved by the black rhinoceros (Diceros bicornis), a large browsing hindgut fermenter. Journal of Animal Physiology and Animal Nutrition, 90(7-8):325-334.

Schwarm, A; Ortmann, S; Hofer, H; Streich, W J; Flach, E J; Kühne, R; Hummel, J; Castell, J C; Clauss, Marcus (2006). Digestion studies in captive Hippopotamidae: a group of large ungulates with an unusually low metabolic rate. Journal of Animal Physiology and Animal Nutrition, 90(7-8):300-308.

Nijboer, J; Clauss, Marcus; Olsthoorn, M; Noordermeer, W; Huisman, T R; Verheyen, C; van der Kuilen, J; Streich, W J; Beynen, A C (2006). Effect of diet on the feces quality in javan langur (Trachypithecus auratus auratus). Journal of Zoo and Wildlife Medicine, 37(3):366-372.

Nijboer, J; Clauss, Marcus; Everts, H; Beynen, A C (2006). Effect of dietary fibre on the faeces score in colobine monkeys at dutch zoos. In: Fidgett, A; Clauss, M; Eulenberger, K; Hatt, J M; Hume, I; Janssens, G; Nijboer, J. Zoo animal nutrition Vol. III. Fürth: Filander, 145-155.

Hummel, J; Nogge, G; Clauss, Marcus; Nørgard, C; Johanson, K; Nijboer, J; Pfeffer, E (2006). Energy supply of the okapi in captivity: fermentation characteristics of feedstuffs. Zoo Biology, 25(4):251-266.

Hummel, J; Pfeffer, E; Nørgard, C; Johanson, K; Clauss, Marcus; Nogge, G (2006). Energy supply of the okapi in captivity: intake and digestion trials. Zoo Biology, 25(4):303-316.

Clauss, Marcus; Hänichen, T; Hummel, J; Ricker, U; Block, K; Grest, P; Hatt, J M (2006). Excessive iron storage in captive omnivores? The case of the coati (Nasua spp.). In: Fidgett, A; Clauss, M; Eulenberger, K; Hatt, J M; Hume, I; Janssens, G; Nijboer, J. Zoo animal nutrition Vol. III. Fürth: Filander, 91-99.

Hummel, J; Clauss, Marcus (2006). Feeding. In: Barta, Z; Clauss, M; Culik, L; Damen, M; Hummel, J; Schleussner, G; Tomasova, K; Zimmermann, W. EAZA Husbandry and Management Guidelines for Giraffa camelopardalis. Arnhem: Burger's Zoo, 29-61.

Hatt, J M; Clauss, Marcus (2006). Feeding Asian and African elephants Elephas maximus and Loxodonta africana in captivity. International Zoo Yearbook, 40(1):88-95.

Hummel, J; Südekum, K H; Streich, W J; Clauss, Marcus (2006). Forage fermentation patterns and their implications for herbivore ingesta retention times. Functional Ecology, 20(6):989-1002.

Clauss, Marcus; Sauter-Louis, C; Chaher, E; Pottgiesser, C; Goebel, S; Selhorst, T; Wichmann, H E; Klee, W; Kienzle, E (2006). Investigations of the potential risk factors associated with cases of bovine spongiform encephalopathy in Bavaria, Germany. Veterinary Record, 158(15):509-513.

Clauss, Marcus; Castell, J C; Kienzle, E; Schramel, P; Dierenfeld, E S; Flach, E J; Behlert, O; Hatt, J M; Streich, W J; Hummel, J (2006). Macromineral absorption in the black rhinoceros (Diceros bicornis) compared with the domestic horse. Journal of Nutrition, 136(7 Supp):2017S-2020S.

Clauss, Marcus; Hofmann, R R; Hummel, J; Adamczewski, J; Nygren, K; Pitra, C; Streich, W J; Reese, S (2006). Macroscopic anatomy of the omasum of free-ranging moose (Alces alces) and muskoxen (Ovibos moschatus) and a comparison of the omasal laminal surface area in 34 ruminant species. Journal of Zoology, 270(2):346-358.

Clauss, Marcus; Sauter-Louis, C (2006). Potential risk factors for BSE (reply to calavas and others). Veterinary Record, 158:743-744.

Clauss, Marcus; Hummel, J; Eloff, P; Willats, R (2006). Sources of high iron content in manufactured pelleted feeds: a case report. In: Fidgett, A; Clauss, M; Eulenberger, K; Hatt, J M; Hume, I; Janssens, G; Nijboer, J. Zoo animal nutrition Vol. III. Fürth: Filander, 101-102.

Clauss, Marcus; Hummel, J; Völlm, J; Lorenz, A; Hofmann, R R (2006). The allocation of a ruminant feeding type to the okapi (Okapia johnstoni) on the basis of morphological parameters. In: Fidgett, A; Clauss, M; Eulenberger, K; Hatt, J M; Hume, I; Janssens, G; Nijboer, J. Zoo animal nutrition Vol. III. Fürth: Filander, 253-270.

Nijboer, J; Clauss, Marcus (2006). The digestive physiology of colobine primates. In: Nijboer, J. Fibre intake and faeces quality in leaf-eating primates. Ridderkerk, The Netherlands: Ridderprint, 9-28.

Clauss, Marcus; Hummel, J; Streich, W J (2006). The dissociation of the fluid and particle phase in the forestomach as a physiological characteristic of large grazing ruminants: an evaluation of available, comparable ruminant passage data. European Journal of Wildlife Research, 52(2):88-98.

Clauss, Marcus; Hatt, J M (2006). The feeding of rhinoceros in captivity. International Zoo Yearbook, 40(1):197-209.

Hummel, J; Clauss, Marcus; Baxter, E; Flach, E J; Johanson, K (2006). The influence of roughage intake on the occurrence of oral disturbances in captive giraffids. In: Fidgett, A; Clauss, M; Eulenberger, K; Hatt, J M; Hume, I; Janssens, G; Nijboer, J. Zoo animal nutrition Vol. III. Fürth: Filander, 235-252.

Clauss, Marcus; Hummel, J (2006). The next meal is today: feeding recommendations in the absence of scientifically sound results – the question of iron availability. In: Fidgett, A; Clauss, M; Eulenberger, K; Hatt, J M; Hume, I; Janssens, G; Nijboer, J. Zoo animal nutrition Vol. III. Fürth: Filander, 103-106.

Clauss, Marcus; Sauter-Louis, C; Chaher, E; Klee, W; Wichmann, H E; Kienzle, E (2006). Ursachenforschung zur Verbreitung von BSE: eine Bestandsaufnahme in Bayern. Kraftfutter, (7-8):20-24.

Clauss, Marcus; Hummel, J (2005). Bemerkungen zur Ernährung von Zootieren: Mischfutterhersteller können wirksam Unterstützung leisten. Kraftfutter, (12):12-17.

Schwarm, A; Ortmann, S; Kühne, R; Caspers, B; Kelm, D; Clauss, Marcus (2005). Comparative analysis of physical and chemical characteristics of faeces from free-ranging and captive collared peccaries (Tayassu tajacu). Proceedings of the European Society of Veterinary and Comparative Nutrition, 9:102.

Hatt, J M; Schaub, D; Wanner, M; Wettstein, H R; Flach, E J; Tack, C; Hässig, M; Ortmann, S; Hummel, J; Clauss, Marcus (2005). Energy and fibre intake in a group of captive giraffe (Giraffa camelopardalis) offered increasing amounts of browse. Journal of Veterinary Medicine Series A, 52(10):485-490.

Clauss, Marcus; Polster, C; Kienzle, E; Wiesner, H; Baumgartner, K; von Houwald, F; Streich, W J; Dierenfeld, E (2005). Energy and mineral nutrition and water intake in the captive Indian rhinoceros (Rhinoceros unicornis). Zoo Biology, 24(1):1-14.

Hatt, J M; Clauss, Marcus; Gisler, R; Liesegang, A; Wanner, M (2005). Fiber digestibility in juvenile Galapagos tortoises (Geochelone nigra) and implications for the development of captive animals. Zoo Biology, 24(2):185-191.

Hummel, J; Clauss, Marcus; Zimmermann, W; Johanson, K; Nørgaard, C; Pfeffer, E (2005). Fluid and particle retention in captive okapi (Okapia johnstoni). Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 140(4):436-444.

Clauss, Marcus; Fröschle, T; Castell, J C; Hummel, J; Hatt, J M; Ortmann, S; Streich, W J (2005). Fluid and particle retention times in the black rhinoceros (diceros bicornis), a large hindgut-fermenting browser. Acta Theriologica, 50(3):367-376.

Clauss, Marcus; Sauter-Louis, C; Kienzle, E (2005). Gibt es ein BSE-Risiko durch Kreuzkontaminationen? Verfütterungsverbot für tierische Bestandteile war sinnvoll. Kraftfutter, (4):26-27.

Dierenfeld, E S; Atkinson, S; Craig, A M; Walker, K C; Streich, W J; Clauss, Marcus (2005). Mineral concentrations in serum/plasma and liver tissue of captive and free-ranging Rhinoceros species. Zoo Biology, 24(1):51-72.

Potter, J S; Clauss, Marcus (2005). Mortality of captive giraffe (Giraffa camelopardalis) associated with serous fat atrophy: a review of five cases at Auckland Zoo. Journal of Zoo and Wildlife Medicine, 36(2):301-307.

Flores-Miyamoto, K; Clauss, Marcus; Ortmann, S; Sainsbury, A W (2005). Nutrition of captive lowland anoa (Bubalus depressicornis): a study on ingesta passage, intake, digestibility, and a diet survey. Zoo Biology, 24(2):125-134.

Clauss, Marcus; Hummel, J; Vercammen, F; Streich, W J (2005). Observations on the macroscopic digestive anatomy of the Himalayan tahr (Hemitragus jemlahicus). Anatomia, Histologia, Embryologia: Journal of Veterinary Medicine Series C, 34(4):276-278.

Clauss, Marcus; Polster, C; Kienzle, E; Wiesner, H; Baumgartner, K; von Houwald, F; Ortmann, S; Streich, W J; Dierenfeld, E S (2005). Studies on digestive physiology and feed digestibilities in captive Indian rhinoceros (Rhinoceros unicornis). Journal of Animal Physiology and Animal Nutrition, 89(3-6):229-237.

Clauss, Marcus; Gehrke, J; Hatt, J M; Dierenfeld, E S; Flach, E J; Hermes, R; Castell, J; Streich, W J; Fickel, J (2005). Tannin-binding salivary proteins in three captive rhinoceros species. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 140(1):67-72.

Clauss, Marcus; Robert, N; Walzer, C; Vitaud, C; Hummel, J (2005). Testing predictions on body mass and gut contents: dissection of an African elephant Loxodonta africana Blumenbach 1797. European Journal of Wildlife Research, 51(4):291-294.

Clauss, Marcus; Hummel, J (2005). The digestive performance of mammalian herbivores: why big may not be that much better. Mammal Review, 35(2):174-187.

Clauss, Marcus (2004). A potential interplay of posture, digestive anatomy, density of ingesta and gravity in mammalian herbivores, or why sloths do not rest upside down. Mammal Review, 34(3):241-245.

Clauss, Marcus; Schwarm, A; Ortmann, S; Thierer, D; Hildebrandt, T; Hohmann, G; Flach, E J; Kühne, R; Hofer, H (2004). Comparative analysis of physical and chemical characteristics of faeces from free-ranging and captive common hippopotami (Hippopotamus amphibius). Advances in Ethology, 38:26.

Hatt, J M; Wenker, C; Castell, J; Clauss, Marcus (2004). Dietary and veterinary management of a lingual abscess in a geriatric captive black rhino (Diceros bicornis). Proceedings of the European Association of Zoo and Wildlife Veterinarians, 5:339-340.

Clauss, Marcus; Lechner-Doll, M; Streich, W J (2004). Differences in the range of faecal dry matter content between feeding types of captive wild ruminants. Acta Theriologica, 49(2):259-267.

Schwarm, A; Clauss, Marcus; Ortmann, S; Alber, D; Flach, E J; Kühne, R; Tack, C; Hofer, H (2004). Energy and mineral nutrition in captive hippopotamidae. Proceedings of the European Association of Zoo and Wildlife Veterinarians, 5:315-316.

Schwitzer, C; Peters, N; Kaumanns, W; Behlert, O; Clauss, Marcus (2004). Evaluation of lemur necropsy reports with special reference to haemosiderosis. Proceedings of the European Association of Zoo and Wildlife Veterinarians, 5:317.

Schaub, D; Clauss, Marcus; Flach, E J; Wettstein, H R; Tack, C; Hatt, J M (2004). Influence of physical and chemical composition of diet on oral stereotypies in captive giraffes (giraffa camelopardalis). Proceedings of the European Association of Zoo and Wildlife Veterinarians, 5:27-28.

Clauss, Marcus; Schwarm, A; Ortmann, S; Alber, D; Flach, E J; Kühne, R; Hummel, J; Streich, W J; Hofer, H (2004). Intake, ingesta retention, particle size distribution and digestibility in the hippopotamidae. Comparative Biochemistry and Physiology - Part A: Molecular and Integrative Physiology, 139(4):449-459.

Wood, C; Clauss, Marcus (2004). Panda phlebotomies? The need for comparative screening for haemochromatosis. Lancet, 364:1384-1385.

Hatt, J M; Gardelle, O; Hauser, B; Clauss, Marcus (2004). Preliminary results of the analysis of liver biopsies for the diagnosis of iron storage diesease in captive lemurs. Proceedings of the European Association of Zoo and Wildlife Veterinarians, 5:23-24.

Behrend, A; Lechner-Doll, M; Streich, W J; Clauss, Marcus (2004). Seasonal faecal excretion, gut fill, liquid and particle marker retention in mouflon ovis ammon musimon, and a comparison with roe deer capreolus capreolus. Acta Theriologica, 49(4):503-515.

Clauss, Marcus; Lendl, C E; Schramel, P; Streich, W J (2004). Skin lesions in alpacas and llamas with low zinc and copper status - a preliminary report. Veterinary Journal, 167(3):302-305.

Clauss, Marcus; Lason, K; Gehrke, J; Lechner-Doll, M; Fickel, J; Grune, T; Streich, W J (2003). Captive roe deer (Capreolus capreolus) select for low amounts of tannic acid but not quebracho: fluctuation of preferences and potential benefits. Comparative Biochemistry and Physiology - Part B: Biochemistry and Molecular Biology, 136(2):369-382.

Flach, E J; Clauss, Marcus; Hunt, A (2003). Copper deficiency in yak (Bos grunniens) at whipsnade wild animal park. In: Fidgett, A L; Clauss, M; Ganslosser, U; Hatt, J M; Nijboer, J. Zoo animal nutrition Vol. II. Fürth: Filander, 103-111.

Clauss, Marcus; Kienzle, E (2003). Cross-contamination of ruminant feed stuffs in Bavaria after the comprehensive feed ban. Deutsche tierärztliche Wochenschrift, 110(12):506-508.

Clauss, Marcus; Kiefer, B (2003). Digestive acidosis in captive wild herbivores: implications for hoof health. Verhandlungsbericht Erkrankungen der Zootiere, 41:57-70.

Clauss, Marcus (2003). Do cows fed BSE-infected meat and bone meal in the colostrum-producing stage pass on infectious BSE agent to their calves? Medical Hypotheses, 61(4):439-443.

Clauss, Marcus; Kienzle, Ellen; Wiesner, Henning (2003). Feeding browse to large zoo herbivores. How much is “a lot”, how much is “sufficient”? In: Fidgett, Andrea L; Clauss, Marcus; Ganslosser, Udo; Hatt, Jean-Michel; Nijboer, Joeke. Zoo animal nutrition Vol. II. Fürth: Filander, 17-25.

Clauss, Marcus; Kienzle, Ellen; Hatt, Jean-Michel (2003). Feeding practice in captive wild ruminants : pecularities in the nutrition of browsers/concentrate selectors and intermediate feeders. A review. In: Fidgett, A L; Clauss, Marcus; Ganslosser, U; Hatt, Jean-Michel; Nijboer, J. Zoo Animal Nutrition Vol. II. Fürth: Filander, 27-52.

Clauss, Marcus; Flach, E J; Tack, C; Lechner-Doll, M; Streich, W J; Hatt, Jean-Michel (2003). Food intake, preference patterns and digestion coefficients in captive giraffe (giraffa camelopardalis) offered a tannin-containing pelleted diet. Verhandlungsbericht Erkrankungen der Zootiere, 41:333-342.

Wood, C; Fang, S G; Hunt, A; Streich, W J; Clauss, Marcus (2003). Increased iron absorption in lemurs: quantitative screening and assessment of dietary prevention. American Journal of Primatology, 61(3):101-110.

Loehlein, W; Kienzle, Ellen; Wiesner, Henning; Clauss, Marcus (2003). Investigations on the use of chromium oxide as an inert external marker in captive Asian elephants (Elephas maximus). Passage and recovery rates. In: Fidgett, A L; Clauss, Marcus; Ganslosser, U; Hatt, Jean-Michel; Nijboer, J. Zoo animal nutrition Vol. II. Fürth: Filander, 223-232.

Clauss, Marcus; Wang, Y; Ghebremeskel, K; Lendl, C E; Streich, W J (2003). Plasma and erythrocyte fatty acids in captive Asian (Elephas maximus) and African (Loxodonta africana) elephants. Veterinary Record, 153(2):54-58.

Clauss, Marcus; Lechner-Doll, Matthias; Streich, W J (2003). Ruminant diversification as an adaptation to the physicomechanical characteristics of forage. a reevaluation of an old debate and a new hypothesis. Oikos, 102(2):253-262.

Clauss, Marcus; Loehlein, W; Kienzle, Ellen; Wiesner, Henning (2003). Studies on feed digestibilities in captive Asian elephants (Elephas maximus). Journal of Animal Physiology and Animal Nutrition, 87(3-4):160-173.

Clauss, Marcus (2003). Tannins in the nutrition of wild animals: a review. In: Fidgett, A L; Clauss, Marcus; Ganslosser, U; Hatt, Jean-Michel; Nijboer, J. Zoo animal nutrition Vol. II. Fürth: Filander, 53-89.

Clauss, Marcus; Kienzle, Ellen; Wiesner, Henning (2003). The botanical, structural and chemical composition of different pelleted feeds used in a captive browsing ruminant, the moose (Alces alces). In: Fidgett, A L; Clauss, Marcus; Ganslosser, U; Hatt, Jean-Michel; Nijboer, J. Zoo animal nutrition Vol. II. Fürth: Filander, 91-101.

Clauss, Marcus; Frey, R; Kiefer, B; Lechner-Doll, M; Loehlein, W; Polster, C; Rössner, G E; Streich, W J (2003). The maximum attainable body size of herbivorous mammals: morphophysiological constraints on foregut, and adaptations of hindgut fermenters. Oecologia, 136(1):14-27.

Clauss, Marcus; Lechner-Doll, M; Flach, E J; Wisser, J; Hatt, Jean-Michel (2002). Digestive tract pathology of captive giraffe. A unifying hypothesis. Proceedings of the European Association of Zoo and Wildlife Veterinarians, 4:99-107.

Clauss, Marcus; Lechner-Doll, Matthias; Hänichen, T; Hatt, Jean-Michel (2002). Excessive iron storage in captive mammalian herbivores. A hypothesis for its evolutionary etiopathology. Proceedings of the European Association of Zoo and Wildlife Veterinarians, 5:123-131.

Clauss, Marcus; Lechner-Doll, Matthias; Streich, Jürgen W (2002). Faecal particle size distribution in captive wild ruminants: an approach to the browser/grazer dichotomy from the other end. Oecologia, 131(3):343-349.

Clauss, Marcus; Jessup, David A; Norkus, Edward B; Chen, Tai C; Holick, Michael F; Streich, W Jürgen; Dierenfeld, Ellen S (2002). Fat soluble vitamins in blood and tissues of free-ranging and captive rhinoceros. Journal of Wildlife Diseases, 38(2):402-413.

Clauss, Marcus; Kienzle, Ellen; Wiesner, Henning (2002). Fütterungspraxis in der Haltung von Elchen (Alces alces). Tierärztliche Praxis. Ausgabe G, Grosstiere/Nutztiere, 30:408-418.

Clauss, Marcus; Kienzle, Ellen; Wiesner, Henning (2002). Importance of the wasting syndrome complex in captive moose (Alces alces). Zoo Biology, 21(5):499-506.

Hatt, Jean-Michel; Gisler, R; Mayes, R W; Lechner-Doll, M; Clauss, Marcus; Liesegang, Annette; Wanner, Marcel (2002). The use of dosed and herbage n-alkanes as markers for the determination of intake, digestibility, mean retention time and diet selection in galapagos tortoises (geochelone nigra). Herpetological Journal, 12(2):45-54.

Clauss, Marcus; Lechner-Doll, Matthias; Flach, Edmund J; Tack, Cliff; Hatt, Jean-Michel (2001). Comparative use of four different marker systems for the estimation of digestibility and low food intake in a group of captive giraffes (giraffa camelopardalis). Zoo Biology, 20(4):315-329.

Clauss, Marcus; Lechner-Doll, M (2001). Differences in selective reticulo-ruminal particle retention as a key factor in ruminant diversification. Oecologia, 129(3):321-327.

Dehnhard, M; Clauss, Marcus; Lechner-Doll, M; Meyer, H H D; Palme, R (2001). Noninvasive monitoring of adrenocortical activity in roe deer (Capreolus capreolus) by measurement of fecal cortisol metabolites. General and Comparative Endocrinology, 123(1):111-120.

Clauss, Marcus; Lechner-Doll, Matthias; Behrend, Anke; Lason, Karin; Lang, Denise; Streich, Wolf J (2001). Particle retention in the forestomach of a browsing ruminant, the roe deer capreolus capreolus. Acta Theriologica, 46(1):103-107.

Hatt, Jean-Michel; Mayes, R W; Clauss, Marcus; Lechner-Doll, M (2001). Use of artificially applied n-alkanes as markers for the estimation of digestibility, food selection and intake in pigeons (columba livia). Animal Feed Science and Technology, 94(1-2):65-76.

Clauss, Marcus; Lechner-Doll, M; Palme, R; Rohleder, M; Dehnhard, M (2000). Stress and disturbance : the effect of long-acting tranquillizer on concentration of faecal cortisol metabolites in captive roe deer (capreolus capreolus) after handling and transport. Advances in Ethology, 35:107.

Clauss, Marcus; Flach, E J; Ghebremeskel, K; Tack, C; Hatt, Jean-Michel (2000). Supplementing the diet of captive giraffe (Giraffa camelopardalis) with linseed extraction chips. In: Nijboer, Joeke; Hatt, Jean-Michel; Kaumanns, W; Beynen, A C; Ganslosser, U. Zoo animal nutrition Vol. I. Fürth: Filander, 271-280.

Clauss, Marcus; Dierenfeld, E S (1999). Susceptibility of yak (Bos grunniens) to copper deficiency. Veterinary Record, 145(15):436-437.

Clauss, Marcus; Suedmeyer, W K; Flach, E J (1999). Susceptibility to cold in captive giraffe (giraffa camelopardalis). Proceedings of the American Association of Zoo Veterinarians:183-186.

Clauss, Marcus; Deutsch, A; Lechner-Doll, M; Flach, E J; Tack, C (1998). Passage rate of fluid and particle phase in captive giraffe (giraffa camelopardalis). Advances in Ethology, 33:98.

This list was generated on Wed Oct 18 03:52:10 2017 CEST.