Covering 800,000 square kilometres of Argentina and Chile, Patagonia is the southernmost part of South America. It’s a place of extremes – of vast ice fields and snow-capped mountains; of windswept deserts and violent oceans. Survival here means being tough enough to cope with brutal winters, and canny enough to exploit brief seasons of plenty. This episode follows a year in Patagonia and sees animals survive in unlikely places.