Hammerhead shark
Hammerhead sharks are a group of sharks which make up the family Sphyrnidae. Their unusual head looks like a hammer.   This "hammer" on its head is also known as the "cephalofoil".   Of the nine species of the Hammerhead sharks, the Winghead shark is in the genus Eusphyra, and the other eight are in the genus Sphyrna.