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Kolter, L., Schach, C., & Weber, T. (1999). Habitat use of feral and Przewalski's horses. Natur- und Kulturlandschaft, 3(332-342).
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Maloiy, G. M., & Boarer, C. D. (1971). Response of the Somali donkey to dehydration: hematological changes. Am J Physiol, 221(1), 37–41.
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Le Pendu, Y., Guilhem, C., Briedermann, L., Maublanc, M. - L., & Gerard, J. - F. (2000). Interactions and associations between age and sex classes in mouflon sheep (Ovis gmelini) during winter. Behav. Process., 52(2-3), 97–107.
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Mitchell, B. L., Skenton, J. B., & Uys, J. C. M. (1965). Predation on large mammals in Kafue National Park. Zool. Afr, 1, 297–318.
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Gallistel, C. R. (1989). Animal Cognition: The Representation of Space, Time and Number. Annual Review of Psychology, 40(1), 155–189.
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Beer C.G. (1995). Trial and error in the evolution of cognition. Behav. Process., 35, 215–224.
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Fiske, J. C. (1979). Behavior and learning in horses Applications in management and training. Southwestern Veterinarian, 32, 37–44.
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Dixon, J. C. (1996). Pattern discrimination, learning-set and memory in a pony. Proceedings of the Paper Presented at the Midwestern ..?, .
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Wingfield, J. C.,, & Ramenofsky, M. (1999). Hormones and the behavioral ecology of stress. In P. H. M. Balm (Ed.), Stress physiology in animals. (pp. 1–51). Sheffield, United Kingdom: Sheffield Academic Press.
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Doutrelant, C., McGregor, P. K., & Oliveira, R. F. (2001). The effect of an audience on intrasexual communication in male Siamese fighting fish, Betta splendens. Behav. Ecol., 12, 283–286.
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