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Schaller, G. B.:. (1964). The Mountain Gorilla: Ecology and Behaviour. Oryx, 7(05), 253–254.
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Ruid, D. B., Paul, W. J., Roell, B. J., Wydeven, A. P., Willging, R. C., Jurewicz, R. L., et al. (2009). Wolf-Human Conflicts and Management in Minnesota, Wisconsin, and Michigan. In A. P. Wydeven, T. R. Van Deelen, & E. J. Heske (Eds.), Recovery of Gray Wolves in the Great Lakes Region of the United States: An Endangered Species Success Story (pp. 279–295). New York, NY: Springer New York.
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Whiten A., & Byrne, R. W. (Eds.). (1997). Machiavellian Intelligence II – Extensions and Evaluations. Cambridge: Cambridge University Press.
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Brooks, S. M. (2006). Animal-assisted psychotherapy and equine-fasciliated psychotherapy. In N. B. Webb (Ed.), Psychotherapy and Equine Facilitated Psychotherapy, (pp. 196–217). New York: Guilford Press.
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Waring, G. H. (Ed.). (2002). Horse Behavior: The Behavioral Traits and Adaptations of Domestic and Wild Horses, Including Ponies. Nrowich, NY: Noyes Publications.
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Waring, G. H. (Ed.). (1983). Horse Behavior: The Behavioral Traits and Adaptations of Domestic and Wild Horses, Including Ponies. Park Ridge: Noyes Publications.
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Krueger, K. (2017). Perissodactyla Cognition. In J. Vonk, & T. Shackelford (Eds.), Encyclopedia of Animal Cognition and Behavior (pp. 1–10). Cham: Springer International Publishing.
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Krueger, K., Marr, I., & Farmer, K. (2017). Equine Cognition. In J. Vonk, & T. Shackelford (Eds.), Encyclopedia of Animal Cognition and Behavior (pp. 1–11). Cham: Springer International Publishing.
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Van Horik, J., Clayton, N., & Emery, N. (2012). Convergent evolution of cognition in Corvids, Apes and other animals. In J. Vonk, & T. Shackelford (Eds.), Oxford Handbook of Comparative Evolutionary Psychology. New York: Oxford University Press.
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Van Horik, J., Clayton, N., & Emery, N. Oxford Handbook of Comparative Evolutionary Psychology (J. Vonk, & T. Shackelford, Eds.). New York: Oxford University Press.
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