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Whiten, A., & Boesch, C. (2001). The cultures of chimpanzees. Sci Am, 284(1), 60–67.
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O'Connell, S., & Dunbar, R. I. M. (2005). The perception of causality in chimpanzees (Pan spp.). Anim. Cogn., 8(1), 60–66.
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Vlamings, P. H. J. M., Uher, J., & Call, J. (2006). How the great apes (Pan troglodytes, Pongo pygmaeus, Pan paniscus, and Gorilla gorilla) perform on the reversed contingency task: the effects of food quantity and food visibility. J Exp Psychol Anim Behav Process, 32(1), 60–70.
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Zehnder, A. M., Ramer, J. C., & Proudfoot, J. S. (2006). The use of altrenogest to control aggression in a male Grant's Zebra (Equus burchelli boehmi). J Zoo Wildl Med, 37(1), 61–63.
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Wagner, G. (1975). [Flight leadership in flocks of homing pigeons]. Z. Tierpsychol., (39), 61–74.
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Roitberg, E., & Franz, H. (2004). Oddity learning by African dwarf goats ( Capra hircus). Anim. Cogn., 7(1), 61–67.
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Dorrance, B. R., & Zentall, T. R. (2001). Imitative learning in Japanese quail (Coturnix japonica) depends on the motivational state of the observer quail at the time of observation. J Comp Psychol, 115(1), 62–67.
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Fiset, S., & Dore, F. Y. (2006). Duration of cats' (Felis catus) working memory for disappearing objects. Anim. Cogn., 9(1), 62–70.
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Holmstrom, M., & Drevemo, S. (1997). Effects of trot quality and collection on the angular velocity in the hindlimbs of riding horses. Equine Vet J Suppl, (23), 62–65.
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Judge, P. G., & de Waal, F. B. (1994). Intergroup grooming relations between alpha females in a population of free-ranging rhesus macaques. Folia Primatol (Basel), 63(2), 63–70.
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