A finger-length fish has reignited a long-running debate about self-awareness, cognition and how much we’ve underestimated ...

Before squaring up for a fight, some fish check themselves out in the mirror to make sure they're big enough. This strange behavior was seen in bluestreak cleaner wrasse (Labroides dimidiatus), who ...

Before deciding whether or not to fight another fish, cleaner wrasse check their own reflection in a mirror and size themselves up. First, Taiga Kobayashi at Osaka Metropolitan University in Japan and ...

Bees play by rolling wooden balls — apparently for fun. The cleaner wrasse fish appears to recognize its own visage in an underwater mirror. Octopuses seem to react to anesthetic drugs and will avoid ...

The myth that goldfish have only a three-second memory might be giving us an unfair view of their mental capabilities. A new study has shown that some fish can recognize themselves in a photograph, ...

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 tiny, orange-vermillion colored fish has been named a new species after a team of divers from Southern California and Mexico found the wrasse in deep water among volcanoes and rugged rocks near the ...