Thresher sharks are known for their remarkably long tails that they use to stun their prey. These sharks can be referred to as fox sharks due to their elongated snouts, or as swiveltail sharks because of their unique tail shape. Another synonym for thresher shark is whip-tailed shark because of the way they move their long tails. They are also called thrasher sharks or thrashing sharks because of their powerful tail movements. Some other names for thresher sharks include sea fox, sea devil, and spot-tail shark. Regardless of what they are called, thresher sharks are fascinating creatures and are capable of reaching impressive speeds of over 50 miles per hour in the water.