According to the International Shark Attack File , housed at the University of Florida: The Hammerhead shark has been attributed with a total of 33 recorded attacks since 1580 with no deaths. A Hammerhead Shark grows to around 20 ft. full grown and is the most manueverable of all sharks; attacks have been blamed on adolescent Hammerheads seeking a mate and accidently trying to "nail" a human. The Great Hammerhead is the most dangerous to man.