There are three species of thresher sharks all characterized by the unmistakably elongated upper lobes of their tail fin. This one, the pelagic thresher shark (Alopias pelagicus) comes to Monad Shoal off Malapascua Island in the Philippines to visit cleaning stations on the reef; Malapascua Island, PhilippinesImage #: 33548755 See More From: Dave Fleetham