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BASHORE, T. L., KEIPER, R., TURNER, J. W. J. R., & KIRKPATRICK J. F. (1990). The accuracy of fixed-wing aerial surveys of feral horses on a coastal barrier island. J. coast. res, 6, 53–56.
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Becker, C. D., & Ginsberg, J. R. (1990). Mother-infant behaviour of wild Grevy's zebra: adaptations for survival in semidesert East Africa. Anim. Behav., 40(6), 1111–1118.
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Boesch C, & Boesch H. (1990). Tool use and tool making in wild chimpanzees. Folia Primatol., 54, 86.
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Byrne, R. W., & Whiten, A. (1990). Tactical deception in primates: the 1990 database (Vol. 27). German Primate Center.
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Byrne, R. W., Whiten, A., & Henzi, S. P. (1990). Social relationships of mountain baboons: Leadership and affiliation in a non-female-bonded monkey. Am. J. Primatol., 20(4), 313–329.
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Cancedda, M. (1990). [Social and behavioral organization of horses on the Giara (Sardinia): distribution and aggregation]. Boll Soc Ital Biol Sper, 66(11), 1089–1096.
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Cassini, M. H., Kacelnik, A., & Segura, E. T. (1990). The tale of the screaming hairy armadillo, the guinea pig and the marginal value theorem. Anim. Behav., 39(6), 1030–1050.
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Charles T. Snowdon,. (1990). Language capacities of nonhuman animals. American Journal of Physical Anthropology, 33(S11), 215–243.
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Chaudhuri, M., & Ginsberg, J. R. (1990). Urinary androgen concentrations and social status in two species of free ranging zebra (Equus burchelli and E. grevyi). J Reprod Fert, 88, 127–133.
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Cheney D.L., & Seyfarth, R. M. (1990). How monkeys see the world: Inside the mind of another species. Chicago: University of Chicago Press.
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