The chimpanzees are the closest living evolutionary relatives to our own species, Homo sapiens. As such, they have long exerted a fascination over those with an interest in human evolution, and human uniqueness. Chrisophe Boesch and Hedwige Boesch-Acherman undertook an incredible observational study of a group of wild chimpanzees in Cote D'Ivoire, spending some fifteen years in the West African forest with them. This fascinating book is the result of these years of painstaking research among the chimps. Chimpanzee behaviour is documented here in all its impressive diversity and variety, and placed within the broader context of research in behavioural ecology. The authors also succeed in shedding light on some of the central questions around the evolutionary relationships between the primates, and in particular the affinity between chimpanzees and humans.