Marmots in Glacier National Park
Marmots are large, stocky animals. The word "hoary" refers to the silver-gray fur on their shoulders and upper back; the remainder of the upper parts have drab- or reddish-brown fur. The head is black on the upper surface, with a white patch on the muzzle, white fur on the chin and around the lips, and grizzled black or brown fur elsewhere.
The Hoary Marmots live in colonies up to 30 or more. They hibernate seven to eight months a year in burrows they excavate in the soil, often among or under boulders. Each colony typically maintain a single hibernaculum and a number of smaller burrows, used for sleeping and refuge from predators.
Hoary marmots mate shortly after they come out of hibernation. They mate in their burrows. A month after mating, the female will give birth to two to four babies. The babies spend their first month in a burrow underground. They will be fully weaned about two weeks after they come out of the burrow. The young will stay with their mother for their first two years.