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An eastern chipmunk eating. Chipmunks have an omnivorous diet primarily consisting of seeds, nuts and other fruits, and buds. They also commonly eat grass, shoots, and many other forms of plant matter, as well as fungi, insects and other arthropods, small frogs, worms, and bird eggs. Around humans, chipmunks can eat cultivated grains and vegetables, and other plants from farms and gardens, so they are sometimes considered pests.
Chipmunk Geography. All chipmunk species except for one-the Siberian chipmunk-are native to North America. As indicated by its name, the eastern chipmunk inhabits most of the eastern half of the United States and Canada.Western chipmunks inhabit the western states as well as most of Canada.The Siberian chipmunk is the only species that is found outside of North America-its range extends throughout northern Asia, from central Russia to Japan.estern chipmunks inhabit the western states as well as most of Canada. The Siberian chipmunk is the only species that is found outside of North America-its range extends throughout northern Asia, from central Russia to Japan.