Ground Sloth, an extinct American sloth related to the anteater and tree sloth of today. Ground sloths disappeared some 10,000 years ago. The body was covered with long, silky hair. The ground sloth had a heavy tail, thick hind legs, and slender forelegs. It sat on its haunches and used its forelegs to reach foliage, its main source of food.
The largest ground sloth, the size of an elephant, was Megatherium americanum of the family Megatheriidae. Other ground sloths, some as small as dogs, belonged to the family Mylontidae.