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 ...

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

This rarely seen glass octopus bared all recently — even a view of its innards — when an underwater robot filmed it gracefully soaring through the deep waters of the Central Pacific Ocean.