A small coral reef fish can recognize itself in a mirror. This discovery challenges long-held ideas about animal intelligence ...

Two species of small, deep-dwelling fish called pearlsides possess eye cells that break the rules of vertebrate vision, combining features of rods and cones into a single hybrid photoreceptor never ...

A month ago, I took a walk through the edge of San Francisco’s Golden Gate Park. I was off the main road, on a dirt and gravel trail. So it was strange to look ahead and see that fish were blocking my ...

In the past, many scientists believed that only mammals and birds could feel or think in complex ways. Reptiles, fish, and insects were seen as simple creatures that reacted purely on instinct. But ...

Researchers at Osaka Metropolitan University in Japan have discovered a previously undiscovered behavior in cleaner wrasse ...

Can we finally retire the myth that goldfish have three-second memories? This oft-cited “fact” has been thoroughly debunked. Scientists have shown that fish can distinguish and remember individuals, ...