Long before today’s tree-dwelling sloths, a 4-ton giant roamed South America — and it may have stood and fought like a bear.

Sloths were not always the slow-moving creatures that we are familiar with today. For millions of years, these fascinating animals exhibited a wide range of sizes and forms, from small, nimble ...

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 ...

Sloths always have a slight smile on their lips, making them appear friendly and cute. These incredibly slow tree dwellers naturally inhabit the tropical rainforests of Central and South America, ...