Winter

In winter, Yellowstone is frozen solid - locked in snow as deep as a house for over six months. While the herds of elk and bison are gradually weakened by the cold, the park's wolves grow stronger - but with one of the world's largest volcanoes beneath the surface, everything from the freezing cold to the creation of a snow storm is determined by the power at Yellowstone's heart. Series following the fortunes of America's wildlife icons in Yellowstone, the most extensive thermal area on Earth, Series following the fortunes of America's wildlife icons in Yellowstone, the most extensive thermal area on Earth.