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here are eight different species of Hammerhead shark. All the species have the remarkable projections on both sides of the head, which probably is they reason why these sharks can detect electronic signals of no more than half a billionth of a volt. The head is probably used during electrolocation. By separating the receptors, the Hammerhead shark can receive signals in stereo. The oddly shaped head also seem to act as a wing that the Hammerhead shark uses for close-quarters maneuverability. The head looks somewhat like a flattened hammer, which is the reason behind the name of the Hammerhead shark. The nostrils and eyes are located at the tip of the extensions. All Hammerhead shark species have proportionately small mouths. The size of the eight different Hammerhead sharks varies between 2 and 6 metres. The largest Hammerhead species, the Great Hammerhead shark, will typically weigh around 230 kg (500 pounds) but can reach a weight of 450 kg (1,000 pounds). Three Hammerhead species can be dangerous to humans: the Great Hammerhead shark, the Scalloped Hammerhead shark and the Smooth Hammerhead sharks.