Scientists searching for fossils high in the Andes mountains in Chile unearthed the remains of this tank-like mammal
that grazed on grasses 18 million years ago in South America. It was about 200 pounds (90 kg) and 2-1/2 feet long (76 cm).It was a primitive member of a line of heavily armored mammals that culminated in the massive, impregnable Gyptodon
, a two-tonne, 10-foot (3 meters) long beast covered in armored plates and a spiky tail that lived until 10,000 years ago.
