For years, scientists felt like the fish they were watching watched them back. A new study suggests they can recognize a diver's outfit.

You don't have to look to outer space to find creatures that are nothing like you would expect to find on Earth. The fish that live and lurk in deep ocean waters almost defy explanation.

Evolving roughly 27 different times in the long history of fish, bioluminescence—the biological production of light—is one of ...

A rarely seen oarfish struggling in shallow waters was spotted off Mexico's coast, sparking curiosity and concern. The deep-sea creature, often linked to legends of impending disasters, has ...