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.

(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 ...

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 ...

Most people are familiar with modern sloths — slow-moving, tree-dwelling mammals that digest food slowly and descend only occasionally. Their closest living relatives are anteaters and armadillos, a ...

(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.) Larisa R. G. DeSantis, Vanderbilt University and Aditya Reddy Kurre, University of ...