The Hammerhead Shark's irregular skull and wides eyes allow him to see the full spectrum of the ocean in front of him. Hammerheads do not tend to venture toward the coast in search of swimmers, but when they do, they are a force to reckon with. They range from 10 to 20+ feet in length, and can weigh up to a half-ton. The ampullae of Lorenzini comprises a group of sensory organs spread across the shark's mallet-shaped head, which allows the shark to track the electric fields generated by nearby fish. The largest of the nine species of Hammerhead sharks is the Great Hammerhead, which reaches 20 feet long, and tips the scales at 1,100 lbs.