Food Habits Least chipmunks eat a wide variety of foods including nuts, berries, fruits, grasses, fungi, snails, insects and possibly some small birds and mammals. From April through October, much of their time is spent foraging. Most mating occurs in April when first emerge from hibernation. Litter size varies from two to six young. Behavior Least chipmunks are adept climbers.
Some individuals construct nests high above the ground.
Least chipmunks are most active between April and October. Nests are built seasonally, with summer homes being constructed from leaves and bark in rotting logs and tree cavities. Least chipmunks are territorial and will defend their nests from invaders. Habitat Least chipmunks are found throughout the boreal and temperate forests of North America. However, least chipmunks prefer more open areas such as forest edges and openings.