In winter, Yellowstone is frozen solid – buried by snow as deep as a house for 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.
out. Elk move down from the mountains to find food, and beavers repair dams before ice freezes their ponds. As the snow and ice return, many animals move out from the heart of Yellowstone, away from the protection of the national park.