The Mylodon Cave Natural Monument is in fact a complex of caves and rock cavities nicknamed “Silla del Diablo” (“the Devil's Chair”). In one of these caves, bones of the mylodon were discovered — a mammal belonging to the group of ground sloths.
The species, which lived in what is now Patagonia, went extinct around 10,000 years ago. Not fully bipedal, the mylodon used its long tail as support to rise on its hind legs and reach leaves growing high on shrubs.
The imposing cavern, 30 m high, 80 m wide and 200 m long, holds a substantial record of the area's paleontological, archaeological and morphological history. Besides mylodon fossils, skeletons of hippidion (an extinct cousin of modern horses), of liptoterns (an extinct cousin of camels) and of sabre-toothed tiger have also been found there.