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Hausberger, M., & Muller, C. (2002). A brief note on some possible factors involved in the reactions of horses to humans. Appl. Anim. Behav. Sci., 76(4), 339–344.
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Heitor, F., do Mar Oom, M., & Vicente, L. (2006). Social relationships in a herd of Sorraia horses: Part II. Factors affecting affiliative relationships and sexual behaviours. Behav. Process., 73(3), 231–239.
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Taillon, J., & Cote, S. D. (2007). Social rank and winter forage quality affect aggressiveness in white-tailed deer fawns. Anim. Behav., 74(2), 265–275.
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