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, ...

Sometimes it nice to just kick back and take it slow. Really slow. So what if evolution had the same mindset, and decided to ...

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.

In a discovery that challenges long-standing views of prehistoric life, scientists have uncovered vast underground tunnels beneath Brazil and Argentina that appear to have been excavated by ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Imagine a sloth. You probably picture a medium-size, tree-dwelling creature hanging ...

Fans of the movie franchise Zootopia know that sloths make the perfect DMV (Department of Mammal Vehicles) workers. Incredibly slow-moving and methodical, Flash Slothmore and the rest of his ...

SAN JOSE, Costa Rica — Researchers in Costa Rica have unearthed fossils from a mastodon and a giant sloth that lived as many ...