There are three species of thresher sharks all characterized by the unmistakably elongated upper lobes of their tail fin. This one, the pelagic thresh

- Image ID: PEC17E
There are three species of thresher sharks all characterized by the unmistakably elongated upper lobes of their tail fin. This one, the pelagic thresh
David Fleetham / Alamy Stock Photo
Image ID: PEC17E
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.