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Preston, S. D., & de Waal, F. B. M. (2002). Empathy: Its ultimate and proximate bases. Behav Brain Sci, 25(1), 1–20; discussion 20–71.
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Bshary, R., Wickler, W., & Fricke, H. (2002). Fish cognition: a primate's eye view. Anim. Cogn., 5(1), 1–13.
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Jolly, A. (1998). Pair-bonding, female aggression and the evolution of lemur societies. Folia Primatol (Basel), 69 Suppl 1, 1–13.
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Corballis, M. C. (2008). Of mice and men – and lopsided birds. Cortex, 44(1), 3–7.
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Shettleworth, S. J. (1993). Varieties of learning and memory in animals. J Exp Psychol Anim Behav Process, 19(1), 5–14.
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de Waal, F. B. M. (2003). Darwin's legacy and the study of primate visual communication. Ann N Y Acad Sci, 1000, 7–31.
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Crook, J. H. (1983). On attributing consciousness to animals. Nature, 303(5912), 11–14.
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Goodwin, D. (1999). The importance of ethology in understanding the behaviour of the horse. Equine Vet J Suppl, (28), 15–19.
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Dunbar, R. I. M. (2007). Male and female brain evolution is subject to contrasting selection pressures in primates. BMC Biol, 5, 21.
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Kiltie, R. A., Fan, J., & Laine, A. F. (1995). A wavelet-based metric for visual texture discrimination with applications in evolutionary ecology. Math Biosci, 126(1), 21–39.
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