In addition to those extant today ( armadillos , anteaters and tree sloths ) , a great diversity of larger types were present , including pampatheres , the ankylosaur-like glyptodonts , various ground sloths , some of which reached the size of elephants ( e.g. Megatherium ) , and even semiaquatic sloths . In addition to those extant today ( armadillos , anteaters and tree sloths ) , a great diversity of larger types were present , including pampatheres , the ankylosaur-like glyptodontids , various ground sloths , some of which reached the size of elephants ( e.g. Megatherium ) , and even semiaquatic marine sloths .