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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.
Diet. Chipmunks are omnivores, meaning they eat foods of both plant and animal origin. In the fall, you can watch them gathering acorns, and in the spring and summer they often feed off the seed contained in bird feeders.