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 ...

Reef "beauty salons" staffed by tiny cleaner fish aren t just for parasite removal they may also shape the microbial life of the entire ecosystem. A fascinating new study shows these bustling fish ...

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, ...