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.

Deep-sea creatures often look more like science fiction monsters than marine animals. The glass octopus is one such animal. The Schmidt Ocean Institute captured this footage of the incredibly rare ...

There are several types of camouflage in the animal kingdom. Most people think of insects that can blend into a pile of ...

This story appears in the June 2018 issue of National Geographic magazine.