Yellowstone: Wildest Winter to Blazing Summer

Yellowstone is unique. There is nowhere else quite like this pristine wilderness. But while it is both stunningly beautiful and home to an abundance of wildlife, it also experiences one of the toughest springs on Earth. In just three months, the landscape transforms. Snow-wrapped winter becomes hot, arid summer. Find out how the wildlife copes with such a dramatic change in conditions. This series captures the grizzly bear emerging from his winter den to find an unexpected food bonanza, wolves struggling to catch prey as elk and bison fight back and great grey owls racing to rear their young before the forest dries out and erupts into fires. These are extraordinary tales from one extraordinary place. (BBC)