Do Chipmunks Eat Lettuce . They can eat both plants and animals. Once they reach adulthood, chipmunks add fruits, nuts, seeds, and grains to their diet. Pet chipmunks animals i need to own Pinterest Chipmunks, Pets and from pinterest.com Legumes like peas and green beans contain nutrients that. Why do squirrel eat lettuce : These include mealworms, crickets, maggots and grasshoppers.