New research on the evolutionary relationships between tree sloths and their extinct giant relatives is challenging decades of widely accepted scientific research. A team of international researchers ...

Scientists have solved the evolutionary puzzle of how sloths went from enormous ground-dwelling giants to the small, famously-laidback tree-climbers of the modern day. The study, by an international ...

A new study challenges decades of scientific opinion concerning the evolutionary relationships of tree sloths and their extinct kin. Scientists have solved the evolutionary puzzle of how sloths went ...

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. But ...

Sloths aren’t just adorable, they’re actually pretty impressive, believe it or not. Some of the world’s biggest creatures spend their lives high above the ground, which feels almost impossible when ...

Two groups of sloths are left on Earth now — two- and three-toed sloths — but there are more that have existed in the Americas throughout history. Some are small creatures that lived up in the trees, ...

Sloths are fascinating creatures known for their slow movements and their almost entirely arboreal lifestyle. These sluggish mammals spend the majority of their lives hanging from the branches of ...