Heart cockles have windows in their shells made from natural optical fibers, allowing light through to the algae inside them.

Millions of Australians grew up by the beach and spent their summers playing in the surf, never knowing deadly critters ...

The most dangerous sea creatures in the world don't always have large teeth like great white sharks or weigh over 10 tons (9 ...

Scientists have discovered one of the largest known sea creatures – a coral the size of two basketball courts – off the ...

A solitary dolphin in the Baltic Sea has been recorded talking to himself, leading researchers to wonder whether he's lonely ...

An unusual sea slug with a large hood, a tail with fingerlike projections and glowing bioluminescence has been found living ...

Researchers were baffled by a bioluminescent mollusk that lives in the deep ocean. They just discovered it's a new species of ...

In a strange episode in the animal kingdom, a captive marine animal merged with another of its kind to become a single ...

Deep-sea researchers have discovered a strange glowing sea slug off the coast of California that lives in the water column — ...

When the going gets tough, these strange sea creatures have the incredibly rare ability to turn back the clock and revert to ...