The Thresher shark, Alopias vulpinus, is a mackerel shark whose tail fin has a greatly elongated upper lobe. This shark is a very strong swimmer that can even vault out of the waters.

A brief description of the thresher shark (Alopias vulpinus).

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All the thresher sharks (Family Alopiidae) have an extremely long upper lobe of the caudal fin. The tail is used to herd and stun small fishes upon which the shark feeds.