Professor James Tilley finds out what we can learn about politics from the power struggles within chimpanzee groups and how our evolutionary past may affect the political decisions that we make today. Interviewing primatologists, evolutionary psychologists and political scientists, he explores the parallels between our political world and that of other primates. These include the way politicians form coalitions, how people choose leaders, loyalties to parties and even how, and when, we go to war. These similarities to other primates reflect our evolutionary heritage and the way in which stone-age human groups settled disputes internally and externally. Producer: Bob Howard.