There's plenty that archaeologists and paleontologists can learn from the bones and other artifacts left behind by ancient creatures and mankind's own ancestors. Researchers can figure out what they ...

New Mexico's White Sands National Monument is a desolate place; sparse vegetation pokes up throughout its salt flats and white gypsum dunes. But the area wasn't always a barren landscape. At the end ...

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SAO PAULO — Sloths weren’t always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge — up to 4 tons — and when startled, they brandished immense claws. For a long time, scientists ...

Ancient sloths ranged in size from tiny climbers to ground-dwelling giants. Now, researchers report this body size diversity was largely shaped by sloths’ habitats, and that these animals’ precipitous ...

Large animals started going extinct at the end of the Pleistocene, just as both climate change and a new predator — Homo sapiens — arrived on the scene. But despite humans’ brutal legacy of killing ...

Modern sloths may be dedicated vegetarians, but at least one of their massive Ice Age cousins chowed down on meat when it had the chance. Darwin’s ground sloth — which could grow to over 3 meters long ...