Primates come under the Life spotlight tonight, as the BBC Natural History Unit series, narrated by David Attenborough, concludes. Intelligence and adaptability allow primates to tackle the many challenges of life. Hamadryas baboons live in groups up to 400 strong, as numbers give them some protection from potential predators. There can be all-out battle with other baboon troupes, as males try to steal females from one another. Japanese macaques beat the freezing conditions in their northerly habitat by having access to a thermal spa in the middle of winter. But this privilege is only for those born of the right female bloodline. An orang-utan baby fails in its struggle to make an umbrella out of leaves, and young capuchins try to smash nuts with a large rock. That's life. Keeping with things planetary, the second installment of Tony Robinson's Man on Earth can be seen at 9.00pm on Channel 4. Tonight, he traces the impact of global warming at the end of the last ice age, discovering it was the catalyst for the dawn of civilisation, but it also unleashed devastation. In Europe, the rise in temperature prompted an agricultural revolution, while in North Africa, a drought led Saharan refugees to settle along the River Nile and learn new social structures, going on to found the Kingdom of Egypt.