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Johnson, D.D.P.; Stopka, P.; Knights, S. Sociology: The puzzle of human cooperation 2003 Nature 467 421 911-2; discussion 912 details   doi
Hockenhull, J.; Creighton, E. Unwanted oral investigative behaviour in horses: A note on the relationship between mugging behaviour, hand-feeding titbits and clicker training 2010 Applied Animal Behaviour Science 5183 127 104-107 details   doi
Henderson, J.; Hurly, T.A.; Healy, S.D. Spatial relational learning in rufous hummingbirds (Selasphorus rufus) 2006 Animal Cognition 2465 9 201-205 details   doi
Friedrich, A.M.; Zentall, T.R. Pigeons shift their preference toward locations of food that take more effort to obtain 2004 Behavioural processes 227 67 405-415 details   doi
Ernst, K.; Puppe, B.; Schon, P.C.; Manteuffel, G. A complex automatic feeding system for pigs aimed to induce successful behavioural coping by cognitive adaptation 2005 Applied Animal Behaviour Science 2898 91 205-218 details   url
Dunbar, R.I.M.; McAdam, M.R.; O'connell, S. Mental rehearsal in great apes (Pan troglodytes and Pongo pygmaeus) and children 2005 Behavioural Processes 2097 69 323-330 details   doi
de Waal, F.B.; Berger, M.L. Payment for labour in monkeys 2000 Nature 190 404 563 details   doi
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
Church, D.L.; Plowright, C.M.S. Spatial encoding by bumblebees (Bombus impatiens) of a reward within an artificial flower array 2006 Animal Cognition 2474 9 131-140 details   doi
Brosnan, S.F.; Schiff, H.C.; de Waal, F.B.M. Tolerance for inequity may increase with social closeness in chimpanzees 2005 Proceedings. Biological sciences / The Royal Society 169 272 253-258 details   doi
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