By Susan Milius
Some of the reef fish that make their living by nibbling parasites off other fish may be luring clients into scams by offering free massages.
Widespread fish called cleaner wrasses (Labroides dimidiatus) normally graze on the parasites and diseased tissue of other species that stop by for grooming, explains Redouan Bshary of the University of Cambridge in England. However, some of the cleaner wrasses cheat now and then by taking a bite of healthy flesh out of a client.