Limestone mesas dominate the foreground, the pale strata angling skyward above what, even by West Texas standards, is a rough dirt road. Above the mesas, higher still, is the Sierra Vieja, red ...

In a paleontological first, researchers have discovered that bees used the jawbones of now extinct mammals as burrows. When ...

"Some 80 types of sloths have existed across 50 million years, and we're left with just two species today." On Hispaniola, scientists previously found six or seven species of ancient sloths. Evidence ...

Deep in the unyielding darkness of a Brazilian cave, a pale, blind, spiny beast carefully feels its way across rust-colored rocks. Meet Paleotoca diminas, a spider new to science. The species, ...

Ancient sloths lived in trees, on mountains, in deserts, boreal forests and open savannahs. These differences in habitat are primarily what drove the wide difference in size between sloth species.

He “realized he had been looking for a ghost, a unicorn, an animal that had been extinct for thousands of years. It was Mylodon.” Gigantic sloth, extinct mammal of the Pleistocene Epoch, drawing ...

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A cave in the Dominican Republic concealed thousands of years worth of animal bones that had been turned into nests by ...