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Mills, D. S., & Nankervis, K. J. (1999).
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Gough, M. R. (1999). A note on the use of behavioural modification to aid clipping ponies. Appl. Anim. Behav. Sci., 63(2), 171–175.
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Lilienfeld, S. O., Gershon, J., Duke, M., Marino, L., & de Waal, F. B. (1999). A preliminary investigation of the construct of psychopathic personality (psychopathy) in chimpanzees (Pan troglodytes). J Comp Psychol, 113(4), 365–375.
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Feh, C. (1999). Alliances and reproductive success in Camargue stallions. Anim. Behav., 57(3), 705–713.
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Vervaecke, H., Vries, H. D., & Elsacker, L. V. (1999). An Experimental Evaluation Of The Consistency Of Competitive Ability And Agonistic Dominance In Different Social Contexts In Captive Bonobos. Behaviour, 136(4), 423–442.
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C. K. Hemelrijk,. (1999). An individual-orientated model of the emergence of despotic and egalitarian societies. Proc. Roy. Soc. Lond. B Biol. Sci., 266(1417), 361.
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MacFadden, B. J., Solounias, N., & Cerling, T. E. (1999). Ancient diets, ecology, and extinction of 5-million-year-Old horses from florida. Science, 283(5403), 824–827.
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Thomas R. Zentall. (1999). Animal Cognition: The Bridge BetweenAnimal Learning and Human Cognition. Psychological Science, 10, 206–208.
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Pennisi, E. (1999). Are out primate cousins 'conscious'? (Vol. 284).
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Koops, M. A., & Abrahams, M. V. (1999). Assessing the Ideal Free Distribution: Do Guppies Use Aggression as Public Information about Patch Quality? Ethology, 105(9), 737–746.
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