When numerous, their mounds can cover large areas of lawn. These mounds are unsightly and often smother the surrounding areas. The tunneling of the ants can also allow the soil to dry out, which may kill patches of grass. Ants will sometimes nest around the roots of grass and kill it. They may prevent grass seed from germinating by feeding on it or by storing it in their nests.
Some ants live in association with root-feeding aphids, which also injure grass.
Also, ants in lawns may invade homes to forage for food and, thus, become household pests. Earthworms Earthworms are usually considered beneficial. When numerous, however, they can become pests by throwing small amounts of unsightly castings on the surface of the soil. The American crow is a large black bird with a purplish sheen and up to 21 inches tall, can sometimes be seen scratching and pecking on a lawn. They are most likely feeding on insects, such as grasshoppers, beetles, grubs or caterpillars.