Moles are carnivorous animals so they don't eat plants. Moles underground tunnels can destroy your lawn or garden if not properly checked. Moles love to eat earthworms. They feed on insects and grubs too. They are usually found on wet lands with rich soil where they find a good number of earthworms. But moles are not entirely bad. They are beneficial in some ways. Moles help to kill grubs that damage grass and shrubs. Moles help to maintain the soil by transporting humus deeper in the soil. They also carry mineral-rich subsoil to the surface of the earth which helps plants to grow. So, moles are not all about destruction. If you have well-behaved moles on your property, you may let them live because they are partners in progress.