Scientists have debunked the belief that using tools is unique to mammals and birds, after documenting tropical fish that ...

Researchers believe the fossils belonged to one of the species of the Osmeriformes family, ancestors to modern graylings and ...

A community of rare fish enthusiasts collects endangered species of freshwater fish from lakes and springs around the world, ...

Wrasse fish use hard surfaces as tools to crack open prey. This behavior shows flexible thinking and environmental awareness.

Near a village in northeastern India, a “dwarf”-like creature with a “large” mouth swam through the river — or tried to, at least. But something pulled it out of the water, moved it around and dropped ...

Deep-sea fish adapt to some of the most extreme conditions on Earth. New research analyzing their evolution finds the same ...

Paleontologists have discovered a newly identified fish species in Australia so well-preserved that they could determine its last meal — dating back up to 16 million years to the Miocene Epoch.

Evolving roughly 27 different times in the long history of fish, bioluminescence—the biological production of light—is one of ...

But for some species, there is still hope. A community of rare fish enthusiasts collect endangered species of freshwater fish from the lakes and springs of East Africa, Mexico and elsewhere ...