Fun Facts About Hammerhead Sharks Unique Head Shape: The hammerhead's distinctive head shape, called a cephalofoil, gives it better visual range. It can see above and below simultaneously, enhancing its hunting ability. Multiple Species: There are nine known species of hammerhead sharks, ranging from the small bonnethead shark to the large great hammerhead shark. Electroreception: Hammerheads use special sensory organs called ampullae of Lorenzini to detect the electrical fields produced by prey