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

This small fish shows self-awareness like apes.

Cleaner wrasse have revealed a remarkable new side of fish intelligence. Marked with fake parasites, they used mirrors to inspect and remove the spots—far faster than seen in earlier tests. Even more ...

A shrimp scrap drifted down the face of a mirror, and a small reef fish tracked it like it was watching a slow-motion ...

If you're not really into salt-water tanks or don't spend a lot of time in coral reefs, there's still a high probability you may have heard of the bluestreak cleaner wrasse fish. Likely because last ...

A little blue-and-black fish swims up to a mirror. It maneuvers its body vertically to reflect its belly, along with a brown mark that researchers have placed on its throat. The fish then pivots and ...

It isn’t until about two years of age that a human being can recognize the image in the mirror as a reflection of herself. It takes time for us to pass the mirror test. And we’re pretty special in ...

Self-awareness may be beyond primates in the wild. Chimps, organutans and other species faced with a mirror react to a dot on their face in the lab, a widely used measure of self-awareness. But while ...

A study in the journal Neuron revealed something surprising about mouse intelligence — specifically, that they can recognize their own reflections. That may seem insignificant, but sociologists ...