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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.
Trending Now. Answers. Chipmunks eat most grain and seed types, though a few are dangerous for them and must be avoided. Definitely unsafe foods are: unripe acorns (contain excess tannin), plum stones (contain cyanide), excessive peanuts (because they can swell inside the animal), and the woods mentioned below, in 'Housing'.