title: Payment for labour in monkeys.
authors.affiliation: Living Links, Yerkes Regional Primate Research Center, and Department of Psychology, Emory University, Atlanta, Georgia 30329, USA. dewaal@emory.edu
authors.forename: F B
authors.initials: FB
authors.lastname: de Waal
authors.forename: M L
authors.initials: ML
authors.lastname: Berger
mesh_terms: D000818:Animals; D005075:Biological Evolution; D002428:Cebus / Q000502:physiology*; D003299:Cooperative Behavior; D005247:Feeding Behavior; D005260:Female; D008297:Male; D012201:Reward