Cleaner wrasse picking parasites of a Fusilier fish. Underwater Macro Image taken scuba diving in Raja Ampat, Indonesia.© SergeUWPhoto/Shutterstock.com Cleaner ...

An Osaka Metropolitan University-led team has demonstrated that bluestreak cleaner wrasse (Labroides dimidiatus) check their body size in a mirror before choosing whether to attack fish that are ...

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 ...

A team of biologists at Osaka City University, working with a colleague from the University of Neuchâte, reports that a type of cleaner fish can pass the mirror test and then recognize itself in a ...

Cleaner wrasse fish, the tiny reef dwellers that pick parasites off larger clients, behave more cooperatively when a potential customer is watching, according to experimental evidence published in ...

SUSAN SCOTT PHOTO A striped cleaner wrasse in Raiatea nibbles on Susan Scott’s leg. The wrasses’ customers seem to love the service, flocking to the wrasse cleaning stations usually held in an ...

Cleaner wrasse play an important role in keeping other reef fish clean and parasite-free. In the study, the fish demonstrated "contingency testing" skills, an attempt to figure out cause-and-effect.