Thresher Shark belongs to the class of Chondrichthyes and the family of Alopiidae. The fin tail of these fishes can be as long as their body. Thresher Sharks prefer to swim around the temperature waters and tropical oceans of the world.
These fishes because of their caudal fin earned the title to be one of the fastest sharks that can swim up to 30mph. These are smart hunters as well and like to hunt in the deep ocean waters generally schools of small fishes.
Thresher Sharks are not a threat to humans and generally swims away seeing a diver.