Hammerhead shark is probably the weirdest type of sharks. There are 9 different species of hammerhead shark worldwide, ranging from 3 to 20 feet in length. The largest being the great hammerhead shark. They are found in warm coastal tropical and temperate waters across the globe. The sharks get their name after specific shape of the head that looks like a flat hammer. The flat shaped head is thought to allow them to detect prey more easily, as it increases the hammerhead sharks sensitivity to sonar activity.