The Smithsonian's National Zoo is home to three Linnaeus's two-toed sloths and shares some sloth basics, but here are three lesser-known sloth facts. 1. The Smithsonian has a collection of fossilized ...

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 ...

Most animals relieve themselves regularly, but sloths drop down from trees just once a week for this task. They use the same spot every time, which makes them vulnerable to predators. Scientists still ...