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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
Zentall, T.R. A cognitive behaviorist approach to the study of animal behavior 2002 The Journal of general psychology 214 129 328-363 details   openurl
Miklósi, Á.; Soproni, K. A comparative analysis of animals' understanding of the human pointing gesture 2006 Animal cognition 463 9 81-93 details   doi
Jones, J.E.; Antoniadis, E.; Shettleworth, S.J.; Kamil, A.C. A comparative study of geometric rule learning by nutcrackers (Nucifraga columbiana), pigeons (Columba livia), and jackdaws (Corvus monedula) 2002 Journal of comparative psychology (Washington, D.C. : 1983) 369 116 350-356 details   openurl
Call, J. A fish-eye lens for comparative studies: broadening the scope of animal cognition 2002 Animal Cognition 2616 5 15-16 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
Seyfarth, R.M. A model of social grooming among adult female monkeys 1977 Journal of Theoretical Biology 5259 65 671-698 details   doi
Heschl, A.; Burkart, J. A new mark test for mirror self-recognition in non-human primates 2006 Primates 2810 47 187-198 details   doi
Smith, D.G.; Pearson, R.A. A review of the factors affecting the survival of donkeys in semi-arid regions of sub-Saharan Africa 2005 Tropical Animal Health and Production 4231 37 Suppl 1 1-19 details   doi
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