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Huge tunnels under southern Brazil and northern Argentina were potentially made by giant, Ice Age sloths for refuge and rest ...

Recent excavations in South America have unearthed a fascinating glimpse into the prehistoric world, revealing the existence of giant, elephant-sized sloths that once carved massive, 2000-foot-long ...

Ancient inhabitants of the Arabian desert created monumental works of rock art on cliff faces, including life-sized images of camels, perhaps as a way to mark sources of water. Michael Petraglia, at ...