the species, and across the many levels of their social behaviour. It explains why sex competition and predation pressures in a forest chimpanzee population made the females of the group highly social and gave the males a high level of within-group solidarity, making them very xenophobic towards outsiders. Love is what makes war possible. Christophe Boesch brings back to the table the debate over ecological pressures and social organization, and the influence they have over issues such as the evolution of warfare, co-operation, altruism and the position of females. Written in an accessible style for a general audience as well as for undergraduate and graduate students, he presents insightful views to give readers the background information to understand the struggle for survival of our closest living relative, the chimpanzee, and through this to find some keys to the ever-so-intriguing question of what makes us human.

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