Hoary marmots are very large rodents. They live on grassy slopes in the mountains in northwestern North America. Hoary marmots like to sunbathe on the rocks. The rocks are also good lookout spots to see enemies or to hide from enemies. Wolves, coyotes, foxes, and lynxes like to eat hoary marmots. Golden eagles find hoary marmots very tasty.
Hoary marmots are sometimes called "whistle pigs." They warn others when danger is near by whistling very loudly. Their whistles can be heard a mile away. Hoary marmots live in little colonies, or neighborhoods. They look out for each other. They live in burrows. Their burrows have several exits. They line their nests in the burrows with grass and hair. This makes the burrows cozy and warm. Hoary marmots may hibernate for as long as eight months.
Hoary marmots curl up in little balls to hibernate. Before they hibernate, they eat lots of food. They store the food in their bodies in an extra layer of fat. This is a special kind of fat known as "brown fat." Hoary marmots are herbivores. They eat plants. They eat different kinds of grasses, roots, berries, and seeds.