Bluestreak cleaner wrasses are entrepreneurial fish.This tiny, shiny species sets up shop in coral reefs, where it eats parasites off of client fish, some of them big and hungry.It's a dangerous business that requires impeccable social skills.No wonder, then, that these fish can identify other individuals by their facesand even recognize their own, according to a recent study in the Proceedings of the National Academy of Sciences USA.
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