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 ...

The bluestreak cleaner wrasse exhibits signs of human-level reasoning and judgment A FISH species examines itself in the mirror before deciding whether to fight in what scientists call the first ...

It’s not easy for fish to clean themselves, without limbs or digits to scrub those hard-to-reach places. Fortunately for them, coral reefs come with cleaning stations. At particular sites, an itchy ...

A species of tiny fish have passed a self-awareness test that's widely considered the gold standard of measuring intelligence in animals. Depending on who you ask, this either means fish are a lot ...