Alopias vulpinus, also known as common thresher or thresher is a kind of mackerel sharks [family Lamnidae]. Conspicuous mainly by the very long upper part of the tail fin they can be found worldwide in coastal temperate and tropical waters. Alopias vulpinus lives as loners or in small, mostly single-sex groups. He is almost found worldwide in coastal and pelagic, in tropical, subtropical and temperate waters of the Atlantic, the Indian Ocean and the Pacific Ocean at depths up to about 350 meters.
His eyes have no nictitating membrane, they are located on the side of the head. They are compared to other sharks strikingly large, but do not reach the top of the head as in other species. The labial both sides of the relatively small mouth are short, the snout is rather tapered.
The common thresher is known for often-meter high jumps out of the water, he is an active, but most of all verry fast swimmer.