Eagerly he collects wood from the ground, snaps the branches into small pieces and carefully balances them in a pile. Then, taking care not to burn himself, he gently strikes a match and gets ready for a fry-up. Like all red-blooded males, Kanzi loves messing around with a barbecue. But then, as these extraordinary pictures show, Kanzi is no man. He is a bonobo - pygmy chimpanzee - and his love of fire is challenging the way that we think about our closest relatives in the animal kingdom. For although bonobo apes and larger chimpanzees use twigs and leaves as...