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Olivier W,. (1987). Is it possible to bring back the quagga? Roan News, 4, 1–2.
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Penzhorn Bl,. (1987). Descriptions of incisors of known – age Cape Mountain Zebras from the Mountain Zebra National park. Onderstepoort J vet Res, 54, 135–141.
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Penzhorn Bl, G. R. (1987). Incisor wear in free – ranging Cape mountain zebras. S Afr J Wildl Res, 17, 99–102.
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Penzhorn Bl, L. P. (1987). Comparisons of reproductive parameters of two Cape mountain zebra populations. J Reprod Fert Suppl, 35, 661–663.
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Schilder Mbh, B. P. (1987). Ethological investigations on a herd of Plains Zebra in a safari park: Time – budgets, reproduction and food competition. App Anim Behav Sci, 18, 45–56.
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SUMMERS PM et al,. (1987). Sucessful transfer of the embryos of Przewalski's horses and Grant's zebra to domestic mares. J Reprod Fert, 80, 13–20.
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Tomasello, M., Davis-Dasilva, M., Camak, L., & Bard, K. (1987). Observational learning of tool-use by young chimpanzees. Human Evolution, 2(2), 175–183.
Abstract: In the current study two groups of young chimpanzees (4–6 and 8–9 years old) were given a T-bar and a food item that could only be reached by using the T-bar. Experimental subjects were given the opportunity to observe an adult using the stick as a tool to obtain the food; control subjects were exposed to the adult but were given no demonstration. Subjects in the older group did not learn to use the tool. Subjects in the younger group who were exposed to the demonstrator learned to use the stick as a tool much more readily than those who were not. None of the subjects demonstrated an ability to imitatively copy the demonstrator's precise behavioral strategies. More than simple stimulus enhancement was involved, however, since both groups manipulated the T-bar, but only experimental subjects used it in its function as a tool. Our findings complement naturalistic observations in suggesting that chimpanzee tool-use is in some sense «culturally transmitted» — though perhaps not in the same sense as social-conventional behaviors for which precise copying of conspecifics is crucial.
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Scheunert, A. T., A. (1987). Lehrbuch der Veterinär-Physiologie. Berlin: Parey.
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Feh, C. (1987). Etude du développement des relations sociales chez des étalons (Equus caballus) de race camargue et de leur contribution à l'organisation sociale du groupe. Master's thesis, Université d'Aix-Marseille, Marseille.
Abstract: Diplôme de recherche universitaire: neurosciences comportementales: Université d'Aix-Marseille II. Faculté des sciences de Luminy Marseille (FRA)* 117p
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Tizard I. (1987). An introduction to veterinary immunology. Philadelphia: WB Saunders Co.
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