The finding suggests the evolutionary jump from fish fins to animal limbs occurred millions of years earlier than previously thought, scientists say.

Fossils of tiny fish that lived 420 million years ago have given scientists the earliest insight yet into how vertebrates developed tooth-bearing jawbones.

Join a dangerous and controversial catch-and-release shark tournament, as sport fishers and scientists join forces to catch and study the ocean's top predators.

See the biggest winners and losers from this month's UN convention on the wildlife trade, which affected animals that appear on menus, in medicines, and in marketplaces worldwide.

New DNA evidence shows that a baby bonnethead shark born in a Nebraska zoo was the product of "virgin birth," the first time the phenomenon has been confirmed in a shark.

At least 7.8 million sharks and thousands of seabirds and sea turtles are killed off southern Africa each year by hooks meant for other animals, a new study says.

At least 20 new species of sharks and rays have been discovered in Indonesia—mostly at local fish markets—scientists have announced.

Flaring gills, three-pointed teeth, and an eel-like body make the frilled shark look like a living fossil. So when a fisher spotted one off Japan, he knew he had something special.

Bite your tongue, Jaws. This prehistoric sea predator packed the most powerful bite of any fish ever—strong enough to shear a shark in half, scientists say.

It may not be pretty, but the eel-like fish has stood the test of time—at least 360 million years, according to a new study of the oldest lamprey fossil ever found.

Sharks with buzzsaw-like jaws, giant terror birds, and spike-toothed pterosaurs were all real-life examples of evolution's twists, turns, and blind alleys.

Squeezed into a six-figure shark costume, explorer Fabien Cousteau—Jacques's grandson—dove among great whites for the new TV special Shark: Mind of a Demon.

Related Photos: Shark-Shaped Sub, Inside and Out

A new species of hammerhead shark has been discovered in South Carolina, but summer swimmers don't have to worry—it's the sharks that are in danger, experts say.

"I pushed the animal, and it immediately took off my hand," says an Indian villager, recounting her shark encounter in this video.

It may have been seen thousands of times by fishermen, but this new species of shark was discovered by scientists only recently in Mexico.