Like all other Hammerhead sharks, the Great Hammerhead Shark has a streamlined body and a "hammer" on its head. They have usually been confused with the Scalloped Hammerhead Shark and the Smooth Hammerhead Shark, but adult Great Hammerhead Sharks can be identified by their wide cephalofoil which has an almost straight margin at the front, and by their first dorsal fin, which is tall and sickle-shaped. The cephalofoil is usually around 1 to 1.5 meters long.