It is an herbivore that eats clovers, grasses, bulbs, leaves, fruits, and bark. When disturbed, it will strike its incisors against one another. It usually is active during the day. The woodchuck may dig tunnels up to five feet long in one day and is known to swim and climb trees. It spends most of each day in its burrow, coming above ground for no more than two hours each day. The woodchuck is a true hibernator.