The hammerhead shark (genus Sphyrna) is a member of the family Sphyrnidae. The only other genus of Sphyrnidae, Eusphyra, contains only one species, E. blochii, the winghead shark). They range from 2?6 m long, and all species have projections on both sides of the head that give it a resemblance to a flattened hammer. The shark's eyes and nostrils are at the tips of the extensions.
They are aggressive predators which eat fish, rays, other sharks, cephalopods, and crustaceans.

They are found in warmer waters along coastlines and continental shelves.