Evolutionary biology, perhaps more than any other branch of science, is a political beast. In trying to explain how life arose, evolutionary biologists are tackling the prickly question of how — and why — we exist. Therefore it is not surprising that, as evolutionary biology advances, it is scrutinised and criticised every step of the way, down to its most fundamental level. We all know that some religious groups reject evolution in favour of a literal, biblical creation; and that others object to the social and moral implications of describing human as just another animal species. But there are also the internal political struggles, which occur both within and between evolutionary biologists.