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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
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
VanDierendonck, M.C. Diff erences in social behaviour between late pregnant, post-partum and barren mares in a herd of Icelandic horses 2006 The Importance of Social Relationships in Horses 2370 Chapter 5 details   url
Williams, N. Evolutionary psychologists look for roots of cognition 1997 Science (New York, N.Y.) 2845 275 29-30 details   openurl
VanDierendonck, M.C. General Discussion 2006 The Importance of Social Relationships in Horses 2372 Chapter 7 details   url
VanDierendonck, M.C. General Introduction 2006 The Importance of Social Relationships in Horses - 2366 Chapter 1 details   url
Pepperberg, I.M. In search of king Solomon's ring: cognitive and communicative studies of Grey parrots (Psittacus erithacus) 2002 Brain, behavior and evolution 579 59 54-67 details   doi
VanDierendonck, M.C. Interventions in social behaviour in a herd of mares and geldings 2006 The Importance of Social Relationships in Horses 2371 Chapter 6 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
Brosnan, S.F.; De Waal, F.B.M. Monkeys reject unequal pay 2003 Nature 179 425 297-299 details   doi
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