What exactly is this unusual blue sea creature? Get to know one of the more unusual members of the sea slug family in our quick look.

Check out the most fascinating and bizarre deep-sea fish the planet has to offer ... which shine pale blue, matching daylight that filters down from above. This makes them almost invisible ...

Could you tell one fish from another if they were the same species? Likely not, but new research suggests they might be able to tell us apart.

Recent sightings of the rare oarfish in Baja California Sur have reignited ancient myths linking these deep-sea creatures to ...

A small yet dazzling fish with electric blue, orange and green patterns. Features bold yellow, blue, and white stripes, ...