Megalodon, the world’s largest known shark species, swam the oceans long before humans existed. Its teeth are all that’s left, and they tell a story of an apex predator that vanished.

A terrifying sight in ancient waters, the megalodon shark was once the most feared creature in the sea.

As the oceans warmed, great whites were more adaptable.

World’s largest fish is struggling to navigate crowded ocean highways, a new study suggests.

With nine brains, blue blood and a talent for camouflage, the octopus is one of the most fascinating creatures in the sea.

Researchers have discovered that great white sharks are more social than previously thought. Using specialized tags, they tracked six sharks and found that some stay close to each other when hunting.

Hard and strong, or bendy and flexible? A cartilaginous skeleton provides advantages in the ocean, but wouldn’t stand up to life on land.

It’s usually good news when a once-scarce species starts to recover – unless it starts getting in humans’ way. An ecologist explains how science can help predict unwelcome encounters.

Which species are becoming endangered and which are recovering, according to the IUCN World Conservation Congress?

These giant predators are helping solve the mystery of Earth's cooling shift some 50 million years ago.