The Common thresher (Alopias vulpinus), also known by many names such as Atlantic thresher, Big-eye thresher, Fox shark, Green thresher, Swingletail, Slasher, Swiveltail, Thintail thresher, Whip-tailed shark and Zorro thresher shark, is the largest species of thresher shark, family Alopiidae, reaching some 6 m (20 ft) in length. About half of its length consists of the elongated upper lobe of its caudal fin. With a streamlined body, short pointed snout, and modestly sized eyes, the common thresher resembles (and has often been confused with) the pelagic thresher (A. pelagicus). It can be distinguished from the latter species by the white of its belly extending in a band over the bases of its pectoral fins. The common thresher is distributed worldwide in tropical and temperate waters, thoug