For years scientists assumed that sloths don't fart — believing the methane produced by their slow digestive system was simply absorbed into their bloodstreams and breathed out through their mouths.

The newest sloth bear (Melursus ursinus) at the Smithsonian’s National Zoo is not so new at all—originally born at the Zoo, his debut on Asia Trail marks his homecoming after seven years. Francois, a ...

This article was published in Scientific American’s former blog network and reflects the views of the author, not necessarily those of Scientific American As I share this with you, it is the ...

Tanganyika Wildlife Park has lost three of its four sloths to chronic kidney disease, part of what officials say is a ...