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Berger J,. (1983). Ecology and catastrophic mortality in wild horses: Implantations for interpreting fossil assemblages. Science 220, , 1403–1404.
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Cohen, J. (2007). Animal behavior. The world through a chimp's eyes (Vol. 316).
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Pennisi, E. (2006). Animal cognition. Man's best friend(s) reveal the possible roots of social intelligence (Vol. 312).
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Pennisi, E. (2006). Animal cognition. Social animals prove their smarts (Vol. 312).
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Weir, A. A. S., Chappell, J., & Kacelnik, A. (2002). Shaping of hooks in New Caledonian crows. Science, 297(5583), 981.
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