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

A woman on vacation on a tropical island had the experience of a lifetime, leaving her in tears after snorkeling.

They are among the oldest creatures on the planet, predating dinosaurs and trees and surviving multiple mass extinctions. They're also hugely diverse, with more than 500 modern species swimming the ...

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

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

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

Hundreds of years ago, people assumed that huge teeth found along the shores of rivers and oceans belonged to dragons. The ...

Scientists uncovered the "mystery mollusk," a strange glowing sea creature lurking in the ocean's midnight depths.

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

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

Video showing the odd, washed-up specimen slowly crawling along the sand was captured in a U.K. nature reserve after a high ...

University of Oxford professor Tim Coulson told London-based business publication The European that the octopus is one of the ...