The Marmot is the largest of the ground squirrel tribe and is often called a "woodchuck" or "groundhog". Its upper back is yellowish brown, and it has a buff-colored under-belly. The Yellow-bellied Marmot dwells at high altitudes and is most often spotted during the summer months sunning itself on rocks. Marmots come out of hibernation in the spring and feed on meadow vegetation.