Flat feet causes pain in the feet, ankles, knees and even the lower back. We've rounded up a half dozen of the best insoles for flat feet to give your body some relief.

Why three-toed sloths risk their lives to help moths Defecating exposes sloths to predators on the jungle floor. An unexpected ally benefits, and returns the favor.

A prehistoric discovery near Hays is shedding some new light on a giant ground sloth species that lived more than 10,000 years ago.

Bones from an extinct ground sloth that stood between 8 and 10 feet tall were found in Kansas. Photo from the Illinois State Museum.

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 ...

Officials discovered the remains of a giant ground sloth and other prehistoric animals near Lubbock while working on a new highway.

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 ...

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 ...

Ancient Humans Hunted 20-Foot-Tall Sloths and Likely Caused the Mammal's Extinction Sloth size and habitat shifted multiple times over the past 35 million years, but human hunting likely drove 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.

An analysis of the sloth family tree suggests three different groups of the animals evolved to gigantic sizes in response to cold and dry conditions ...

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 ...