Why do thresher sharks have such large rear fins?



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    Thresher sharks use their extremely long tail fins in hunting for food. By slapping the water’s surface with their tail fin, a thresher shark herds fish into tight schools that are easier to attack. They may then use the fin as a “whip,” that can stun or even kill fish in the school. This fascinating hunting behavior is one of the truly unique things about this shark species.

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