Fish

Sharks easily consumed large, spiky sea urchins – sometimes in just a few gulps.

This living fossil can grow as large as an alligator, has two rows of needle-sharp teeth, and such strong armor that it survived predatory dinosaurs.

"The Secret History of Sharks" author John Long met with Live Science to discuss his new book, recent revelations about megalodons, and how he got over his fear of great whites.

An angular roughshark pulled from the water near Elba, an Italian island near Tuscany.

An eel inside the digestive tract of a dark sleeper fish before its escape attempt.

In mythology, giant oarfish are said to foreshadow earthquakes, although evidence shows this is not the case.

A pregnant porbeagle shark is believed to have been eaten by a great white, with the larger predator swallowing its tracking device off the coast of Bermuda, scientists report.

Beachgoers found a rare oarfish off California two days before an earthquake, mirroring folklore that says the deep-sea creatures are "doomsday fish."

This slimline, eel-like fish has no scales for protection so chooses to use a sea cucumber's sphincter for safety.

Scientists found three distinct great-white-shark populations that congregate in different oceans and do not interbreed. Their separation may have implications for conservation.