Long before today’s tree-dwelling sloths, a 4-ton giant roamed South America — and it may have stood and fought like a bear.

Researchers in Costa Rica have unearthed fossils from a mastodon and a giant sloth that lived as many as 40,000 years ago, officials announced Friday, calling it the biggest such find here in decades.

A sloth perches languidly on a branch in one of Costa Rica’s vast forest preserves. (Gabriella Chavez/WUFT News) LA FORTUNA, COSTA RICA — Near a lively stretch of Highway 142, one of Costa Rica’s ...

Sloth World is rapidly approaching a grand opening on Orlando’s International Drive, its executives say. The 7,500-square-foot facility will be home to more than 40 sloths living in a ...

While humans wouldn’t be very happy to find that organisms were growing on their skin, particularly fungi, algae, and insects, it works out pretty well for sloths. Sloths may be hosting entire ...

Scientists have analyzed ancient DNA and compared more than 400 fossils from 17 natural history museums to figure out how and why extinct sloths got so big. Most of us are familiar sloths, the ...

Sloths appear to have life figured out, and once the details are revealed, being envious makes sense. These tree-dwelling mammals have survived for millions of years by doing things their own way, and ...