Yellowstone: Wildest Winter to Blazing Summer

It's summer - and the Yellowstone beavers have a new challenge.

Will the young survive as the river dries up and the colony is forced to move home? As food becomes scarce wolves have a surprising strategy to keep their pups fed and grizzly bears are unexpected visitors on a cowboy ranch.

By midsummer the hot dry conditions create a new danger - deadly wildfires burn out of control and threaten to engulf a family of great grey owls. 2016 was the hottest year on earth since records began, and across Yellowstone scientists reveal the effects of rising temperatures on the animals that live here.

Presented by Kate Humble and Patrick Aryee.