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Castley, J. G., & Knight, M. H. (1997). Population status of plains zebra, Equus burchelli, in South African National Parks. Scientific Services, National Parks Board, .
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Bayley, L., & Maxwell, R. (Eds.). (1997). Understanding Your Horse: How to Overcome Common Behaviour Problems. Trafalgar Square Publishing.
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Darwin, C. (1997). The Descent of Man; Reprint edition. Amherst, New York: Prometheus Books;.
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Krebs, J. R., & Davies, N. B. (1997). Behavioural ecology : an evolutionary approach. Cambridge, Mass.: Blackwell Science.
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Giraldeau, L. - A. (1997). The ecology of information use. In J. R. Krebs, & N. B. Davies (Eds.), Behavioural ecology : an evolutionary approach. Cambridge, Mass.: Blackwell Science.
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Tomasello, M., & Call, J. (1997). Primate Cognition. Oxford: Oxford University Press.
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Roberts, M. (1997).
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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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Shmidt Mech, L. D. (1997). Wolf pack size and food acquisition. Am Nat, 150.
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Kräußlich, H., & Brem, G. (1997). Tierzucht und allgemeine Landwirtschaftslehre für Tiermediziner. Stuttgart: Enke.
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