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Ash, C., Chin, G., Pennisi, E., & Sugden, A. (2007). Living in Societies. Science, 317(5843), 1337–.
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van der Kolk, J. H., Nachreiner, R. F., Schott, H. C., Refsal, K. R., & Zanella, A. J. (2001). Salivary and plasma concentration of cortisol in normal horses and horses with Cushing's disease. Equine Vet J, 33(2), 211–213.
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Dyer, F. C. (2000). Individual cognition and group movement: insights from social insects. In P. Garber, & S. Boinski (Eds.), Group Movement in Social Primates and Other Animals: Patterns, Processes, and Cognitive Implications.. Chicago: University of Chicago Press.
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Moss, C. J., & Poole, J. H. (1983). Relationships and social structure in African elephants. In R. A. Hinde (Ed.), Primate social relationships: an integrated approach.. Blackwell Science Ltd.
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Heipertz- Hengst, C. (1999). Pferde richtig trainieren. Lüneburg: Cadmos.
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McCall, C. A., Potter, G. D., Friend, T. H., & Ingram, R. S. (1981). Learning abilities in yearling horses using the Hebb-Williams closed field maze. J. Anim. Sci., 53(4), 928–933.
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Goodwin, D., McGreevy, P. D., Heleski, C., Randle, H., & Waran, N. (2008). Equitation science: The application of science in equitation. Journal of Applied Animal Welfare Science, 11(3), 185–190.
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Morgan, C., & Morgan, C. (1829). On Foot Lameness In Horses. The Lancet, 11(289), 751–752.
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Boesch, C. (1991). Teaching among wild chimpanzees. Anim. Behav., 41(3), 530–532.
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Packer, C. (1977). Reciprocal altruism in Papio anubis. Nature, 265, 441–445.
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