The Atlantic sturgeon was driven to extinction in Europe by the middle of the 20th century. In Sweden’s Göta River, a ...

Almost all animals have symmetrical bodies. Bilateral symmetry is almost universal in all animals and is only very rarely broken—with exceptions like the five-armed starfish or crab species that have ...

There have been quite a few interesting sea creatures washing up on our shores lately. A viewer sent us video via the Report It feature on our website of a sunfish in West Oahu. It was floating in one ...

In a river near a police department in southern Brazil, thousands of catfish amassed at the base of a waterfall and began to climb. The unusual fish gathering caught the attention of police officers — ...

Antarctic icefish are transparent, white-blooded fish that lack red blood cells and hemoglobin. Antifreeze proteins in their blood prevent ice crystals from forming in frigid seas. Enlarged gills, ...

A strange, armor-plated fish surfacing in a local pond has left officials stunned — and raised alarm about what it could mean for nearby communities and ecosystems. An unusual fish spotted in a ...