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 what makes humans unique. Chrisophe Boesch and Hedwige Boesch-Acherman undertook an incredible observational study of a group of wild chimpanzees of the Tai forest in Cote D'Ivoire, spending some fifteen years in the West African jungle with them. This fascinating...