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 2 of 3
Cameras continue to follow the wildlife dramas in Yellowstone as spring brings many new challenges. A family of beavers is busy making the most of the spring vegetation. A mother grizzly and her cubs – and explains that the biggest dangers come not from other predators, but surprisingly from their own kind.