Paleontologists in Argentina have discovered what they say is one of the oldest-known fossils of the ground sloth Megatherium. Life reconstruction of Megatherium. Image credit: Sebastián Rozadilla. Megatherium is an extinct genus of ground sloths that lived in South America from the Early Pliocene epoch (5 million years ago) through the end of the Pleistocene epoch (11,700 years ago). The earliest and smallest known species of the genus is Megatherium...
