The barreleye is a small deep-sea fish, measuring about 6 inches (15 cm) long. Its most striking feature is its transparent head, which allows you to see the fish's internal structures ...

A scary-looking creature with “devil” in its name was spotted close to the surface off Tenerife, a Spanish island.

Over the past 60 years, marine biologists at UC Santa Cruz have monitored the behavior of northern elephant seals that ...

To move, this species uses two fins—one pectoral and one dorsal—that are so thin they are almost transparent. As with sea horses, sea dragon males are responsible for childbearing. But instead ...

Weedy sea dragons have very long, thin snouts; slender trunks covered in bony rings; and thin tails which, unlike their seahorse cousins, cannot be used for gripping. They have small, transparent ...

Researchers say the new footage of the deep sea fish may be the first live sighting of the creature in daylight near the ocean's surface Brenton Blanchet is a writer-reporter at PEOPLE.