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

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 ...

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 ...

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 ...

Female cleaner fish are sensitive to what their partners can and cannot see while working on client fish. This means they may have theory of mind, a concept built on awareness of other’s perspectives, ...