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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.
The two main species are the eastern and western chipmunk. Eastern chipmunks have three dark stripes while the western species has five. Both are small only reaching 8-10 inches at maturity. Either can hibernate, but western chipmunks seem more likely to stay active all year. Both species breed in the spring and summer months.