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  Author Title (up) Year Publication Serial Volume Pages Links
Clement, T.S.; Feltus, J.R.; Kaiser, D.H.; Zentall, T.R. “Work ethic” in pigeons: reward value is directly related to the effort or time required to obtain the reward 2000 Psychonomic bulletin & review 248 7 100-106 details   openurl
de Waal, F.B.M. A century of getting to know the chimpanzee 2005 Nature 162 437 56-59 details   doi
Shapiro, A.D.; Janik, V.M.; Slater, P.J.B. A gray seal's (Halichoerus grypus) responses to experimenter-given pointing and directional cues 2003 Journal of Comparative Psychology 4977 117 355-362 details   doi
Bonnie, K.E.; de Waal, F.B.M. Affiliation promotes the transmission of a social custom: handclasp grooming among captive chimpanzees 2006 Primates 161 47 27-34 details   doi
Kendal, R.L.; Coe, R.L.; Laland, K.N. Age differences in neophilia, exploration, and innovation in family groups of callitrichid monkeys 2005 American journal of primatology 2148 66 167-188 details   doi
Gould, J.L. Animal cognition 2004 Current Biology : CB 4169 14 R372-5 details   doi
Sarter, M. Animal cognition: defining the issues 2004 Neuroscience and Biobehavioral Reviews 2804 28 645-650 details   doi
Watanabe, S.; Huber, L. Animal logics: decisions in the absence of human language 2006 Animal Cognition 2453 9 235-245 details   doi
Allen, C. Assessing animal cognition: ethological and philosophical perspectives 1998 Journal of Animal Science 2750 76 42-47 details   openurl
Miller, R.M. Behavior and misbehavior of the horse 2001 The Veterinary Clinics of North America. Equine Practice 1894 17 379-87, ix details   openurl
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