Researchers scoured mountainous areas on their hands and knees looking for signs of the rare species' survival, according to ...

Sloths weren't always slow-moving, furry tree-dwellers. Their prehistoric ancestors were huge - up to 4 tons - and when startled, they brandished immense claws. For a long time, scientists believed ...

The gulper eel ( Saccopharynx lavenbergi), also called a pelican eel, is roughly a meter of tail and mouth. This unusual fish, the only species in the genus Eurypharynx, slinks through the water as ...

Imagine a sloth. You probably picture a medium-sized, tree-dwelling creature hanging from a branch. Today's sloths—commonly ...