Journey to Yellowstone National Park, where wolves, grizzlies, beavers and owls survive one of the greatest seasonal changes on the planet. As the temperature swings 140 degrees, cameras capture how the animals cope. The series is hosted by renowned paleontologist and author Kirk Johnson.

Part 1 of 3
Learn whether the brutal winter weather will favor predator or prey. Find out how Yellowstone’s unique geology affects the mighty bison. Can the grizzlies that emerge early survive? Are the wolves and Great Gray owls in danger of starvation?