What can be said about squirrels? They don't do anything to benefit your garden, but the comic relief they can provide is immeasurable. Feed a squirrel and it's likely never to leave your yard. Squirrels cannot digest cellulose and must rely on foods rich in protein, carbohydrates, and fat. Hence the style of the feeders we recommend. Though their diet encompasses a wide range of items, corn and nuts are among their favorites. If a steady supply is available, they will always keep coming back for more.