the great hammerhead shark is the largest species of hammerhead shark, coming from australia, africa, south america, north america, and parts of asia. Great hammerhead sharks can be distinguished from other hammerheads by the shape of its hammer, which is wide with an almost straight front margin, and by its tall, sickle-shaped first dorsal fin. Great hammerhead skarks hammer shaped head is used to immoblize stingrays.