Movie: Great Yellowstone Thaw, Part 1

Yellowstone is home to North America's most iconic wildlife, and every year these animals must survive the Thaw - one of the harshest seasonal changes on Earth. Temperatures can swing from minus 40°F in winter to almost 100°F in summer. To understand how the animals cope, this series follows the Thaw during 2016 - a year when the unpredictable weather broke new records. In this episode: Surviving winter can be tough for the wildlife of Yellowstone. Will this year’s weather favor predator or prey? Will the grizzlies that emerge early survive, and why are the wolves and Great Gray Owls in danger of starvation? Plus find out how Yellowstone’s geology affects the mighty bison. 50 min.