New research delves deep into the meaning behind these big-mouth contests. When male sarcastic fringeheads get aggressive with each other — which they often do — they open their unusually wide ...

Angler's also have a distinctive wide mouth making it easy for the fish to munch on prey of various sizes. Additionally, Angler teeth curve inwardly in order to prevent prey from escaping.

When fighting over territory, the fish try to intimidate their opponents by opening their jaws wide to display the bright colors inside. "The mouth's intimidating coloration, combined with the ...

The bigger fish, with larger jaws, tended to win these contests. Both in the wild and in the lab, the team didn’t see males gaping wide at females. Instead, they appear to court them with ...

Deep below the surface of the ocean, some 650-3,000 feet below, you might find one of nature’s terrifying predatory fish dubbed the dragonfish. These things look like eels with freaky heads and ...

When told about a strange, fanged fish that had washed ashore on an Oregon beach, ... which had fanged teeth within a wide mouth and measured nearly 5 feet long, as a longnose lancetfish.

This fierce fish grows 20 new teeth each day. The Pacific lingcod, which feasts upon a wide variety of prey, replaces teeth much faster than expected—and it might not be alone.