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

Controversial new research shows that a tiny, unsuspecting species of fish can pass a test that’s widely considered the gold standard of intelligence. As far as we can tell, only a few of the most ...

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 ...

Sometimes the best place to hide is right under everybody's nose. If you look like you are innocuous and you belong there, every so often you can get away with trouble. Animal mimics can resemble ...

Cleaner wrasse perform a cleaning service for coral reef fish -- namely eating parasites off their customer's skin. However, what the females of some species actually want is to lure in clients and ...

Scientists often warn against anthropomorphism — the attribution of human characteristics to animals or even nonliving things. But it’s hard to resist the charm of Labroides dimidiatus, a species of ...