For over 25 years, primatologists have speculated that intelligence, at least in monkeys and apes, evolved as an adaptation to the complicated social milieu of hard-won friendships and bitterly contested rivalries. Yet the Balkanization of animal research has prevented us from studying the same problem in other large-brained, long-lived animals, such as hyenas and elephants, bats and sperm whales. Social complexity turns out to be widespread indeed. For example, in many animal societies one individual's innovation, such as tool use or a hunting technique, may spread within the group, thus creating a distinct culture. As this collection of studies on a wide range of species shows, animals develop a great variety of traditions, which in turn affect fitness and survival.

The editors argue that future research into complex animal societies and intelligence will change the perception of animals as gene machines, programmed to act in particular ways and perhaps elevate them to a status much closer to our own. At a time when humans are perceived more biologically than ever before, and animals as more cultural, are we about to witness the dawn of a truly unified social science, one with a distinctly cross-specific perspective?

In more ways than we may sometimes care to acknowledge, the human being is just another primate--it is certainly only very rarely that researchers into cognition, emotion, personality, and behavior in our species and in other primates come together to compare notes and share insights. This book, one of the few comprehensive attempts at integrating behavioral research into human and nonhuman primates, does precisely that--and in doing so, offers a clear, in-depth look at the mutually enlightening work being done in psychology and primatology.

Relying on theories of behavior derived from psychology rather than ecology or biological anthropology, the authors, internationally known experts in primatology and psychology, focus primarily on social processes in areas including aggression, conflict resolution, sexuality, attachment, parenting, social development and affiliation, cognitive development, social cognition, personality, emotions, vocal and nonvocal communication, cognitive neuroscience, and psychopathology. They show nonhuman primates to be far more complex, cognitively and emotionally, than was once supposed, with provocative implications for our understanding of supposedly unique human characteristics. Arguing that both human and nonhuman primates are distinctive for their wide range of context-sensitive behaviors, their work makes a powerful case for the future integration of human and primate behavioral research.