Discover how Megatherium americanum, often seen as a giant sloth, may have been an ancient predator instead of a mere herbivore. The lethargic two-foot-long tree-hugging sloths of the South and ...

Add Yahoo as a preferred source to see more of our stories on Google. Harlan's ground sloth fossil skeleton excavated and displayed at the La Brea Tar Pits in Los Angeles. Larisa DeSantis A two-toed ...

Each year 500,000 people visit New Mexico's White Sands National Monument to hike and frolic among gypsum dunes. Aside from the tourists, few animals in the region get much larger than a coyote or ...