Sloths weren’t always the slow, tree-hugging creatures we know today. For millions of years, they came in a wild variety of ...

New research shows 8,000-pound sloths once dug caves, adapted to oceans, and roamed widely—until climate and humans brought ...

Sloths may be the slowest animals on Earth, but their biology is anything but sluggish! In this mind-blowing video, we dive into the insane science behind sloths’ unique and fascinating physiology.

Sloths might move at a glacial pace, but their biology is anything but boring. In this captivating exploration of one of nature’s most unusual creatures, we dive deep into the insane science behind ...

Defecating exposes sloths to predators on the jungle floor. An unexpected ally benefits, and returns the favor.

Giant sloths with razor-sharp claws and as large as Asian bull elephants once roamed the Earth, snacking on leaves at the tops of trees with a prehensile tongue. Now, scientists have figured out ...

The sloth family tree once sported a dizzying array of branches, body sizes and lifestyles, from small and limber tree climbers to lumbering bear-sized landlubbers. Why sloth body size was once so ...

Breakthroughs, discoveries, and DIY tips sent every weekday. Terms of Service and Privacy Policy. Giant sloths used to roam all over North America. Over 10 times ...

Tree sloths have reportedly survived falls of up to 100 feet. However, given that falls from even moderate heights can cause severe damage and some trees in the Amazon Rainforest top out at just ...

Bones from an extinct ground sloth that stood between 8 and 10 feet tall were found in Kansas. Photo from the Illinois State Museum. At the end of the Pleistocene Epoch, 2.6 million to 11,700 ...