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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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Povinelli DJ, Nelson KE, & Boysen ST. (1990). Inferences about guessing and knowing in chimpanzees (Pan troglodytes). J. Comp. Psychol., 104, 203.
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Holmstrom, M., Magnusson, L. E., & Philipsson, J. (1990). Variation in conformation of Swedish warmblood horses and conformational characteristics of elite sport horses. Equine Vet J, 22(3), 186–193.
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Spear, N. E., Miller, J. S., & Jagielo, J. A. (1990). Animal Memory and Learning. Annual Review of Psychology, 41(1), 169–211.
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Cheney, D. L., & Seyfarth, R. M. (1990). The representation of social relations by monkeys. Cognition, 37(1-2), 167–196.
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Petherick, J. C., & Rutter, S. M. (1990). Quantifying motivation using a computer-controlled push-door. Appl. Anim. Behav. Sci., 27(1), 159–167.
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Wiesner, J., & V. Hegel, G. (1990). Zur Immobilisation von Wildequiden mit STH 2130 und Tiletamin/Zolazepam. Tierärzl Prax, 18, 151–154.
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Franke Stevens, E. (1990). Instability of harems of feral horses in relation to season and presence of subordinate stallions. Behaviour, 112(3-4), 149–161.
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Visalberghi E. (1990). Tool use in Cebus. Folia Primatol., 54, 146.
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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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