Fish

The turbulent lower Congo River, home to hundreds of fish species, is not only Earth's deepest river; it also presents biologists with an intriguing window into evolution.

Scary portrayals of great whites in pop culture might lead some people to wonder if the world would be better off with no sharks at all.

Baby fish swam in schools 50 million years ago, according to this remarkable fossil held in a Japanese museum.

What's the story behind reefs' mysterious "halos" of empty sand?

A fossil site in North Dakota preserves a unique snapshot of the minutes after an asteroid struck Earth around 66 million years ago.

What happened after the Cretaceous-ending asteroid struck Earth? A new fossil site may have answers.

A fish so mysterious that scientists named it the "hoodwinker" because it had eluded them for decades has washed ashore in California, thousands of miles from its home in the Southern Hemisphere.

Photographers from around the world competed to take home the top prizes in the 2019 Underwater Photographer of the Year contest.

Mary's species of fish never evolved to have sex or incubate live young. She did it anyway.

Teaser: A re-examination of the fossil record has produced a new theory of the super-fish's demise.

As part of a drinking game, a 28-year-old man from the Netherlands attempted to swallow a living fish with some powerful natural defenses.

Lingering traces of preserved hagfish goo hint at the lineage of this slimy creature.

The little sharks swim around inside their mom, switching between her multiple uteruses. When they get hungry they eat her unfertilized eggs.

Fish do it. So do jellyfish, starfish and sea cucumbers.

The little sea monster used its mouth full of scissor teeth to rip flesh from other fish.

A new species of swamp eel that tunnels through dirt will haunt your nightmares.