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Primate Psychology (Harvard University Press, £24.95/$39.95) is a fascinating update of this field of research, written by 29 specialists. It deals with humans as well as other primates, a rare integration, and is enlightening when looking at social processes such as parenting. The editor, Dario Maestripieri, has included papers that point out gaps in our knowledge: for example, what has and has not been studied in conflict resolution among primates.