Sloths look slow in a way that almost doesn’t feel real, but their sluggish movement isn’t a flaw or a weakness. Every part of their body is built around saving energy, avoiding danger, and surviving ...

Sloths look simple from a distance: slow mammals, quiet days in trees, same route, same rhythm. That picture is wrong in useful ways. The group itself is more diverse than most people assume, with two ...

A sloth in its natural habitat in Costa Rica, where sloth populations have decreased in the past decade, according to Rebecca Cliffe, lead author of the research. Bernd Dittrich via Unsplash In the ...

A sloth scientist, her tree-climbing BFF, and their dog work to save Costa Rica’s sloth populations. A sloth scientist, her tree-climbing BFF, and their dog work to save Costa Rica’s sloth populations ...

A cooling, drying climate turned sloths into giants – before humans potentially drove the huge animals to extinction. Today’s sloths are small, famously sluggish herbivores that move through the ...

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 ...