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Walton A,. (1960). Copulation and natural insemination..
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WARING GH et al,. The behaviour of horses. (pp. 330–369).
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Zeuner Fe,. (1967). Der Halbesel. (pp. 311–316).
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Zeuner Fe,. (1967). Esel und Maultier. (pp. 316–324).
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McGregor, P. K., & Dabelsteen, T. (1976). Communication Networks. In D. E. Kroodsma, & E. H. Miller (Eds.), Ecology and evolution of acoustic communication in birds (pp. 409–425). Ithaca: Cornell University Press.
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Fragaszy, D., & Visalberghi, E. (1996). Primates “primacy” reconsidered. In C. Heyes, & B. G. Galef (Eds.), Social learning in animals: the roots of culture (pp. 65–84). Academic Press, Inc.
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Berger, J.,. (1988). Social systems, resources, and phylogenetic inertia: an experimental test and its limitations. In C. N. Slobochikoff (Ed.), Ecology of Social Behavior (pp. 157–186). San Diego: Academic Press.
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Maddock, L. (1995). The “migration” and grazing succession. In A. R. E. Sinclair, & A. R. E. Norton-Griffiths (Eds.), Serengeti: Dynamics of an Ecosystem. Chicago: University Of Chicago Press.
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Miller, R. (1979). Band organisation and stability in Red Desert feral horses. In R.H. Denniston (Ed.), Proceedings of a Conference on the Ecology and Behavior of Feral Equids (pp. 113–123). Laramie: University of Wyoming.
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