This programme deals with those who stay during the coldest weather. As almost all animal inhabitants of Antarctica are forced to migrate, the sea underneath the ice still provides a home to many specially adapted fish whose cells are protected from freezing through an inherent "antifreeze". Many feed on the faeces of other animals. Perhaps the most notable larger creature that does not journey north is the Weddell seal, which can be found as close as 1300 kilometres to the pole. Groups of seals tear holes into the ice to dive for food and come up to breathe. The females come back to the ice to give birth. Also described is primitive plant life such as lichen, which can still be found on the continent in winter, even in the extremely dry and permanently frozen valleys — conditions under which dead animals can lie frozen for many centuries without decomposing. Attenborough observes that the Antarctic plateau is so "forbidding, hostile and desolate" that human life there seems not only insignificant, but also "totally irrelevant". Also explored is the life of the Emperor penguin, "the only birds to lay their eggs directly on ice". While others retreat, Emperors migrate not just to the ice, but into Antarctica itself. The newly laid egg is quickly transferred from female to male. They then incubate the eggs under the harshest conditions on Earth (huddling closely together in temperatures of minus 70 °C), while their partners return to the sea.
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