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There are 10 species of hammerhead shark, with the largest being the Great Hammerhead ... s International Shark Attack File. In the world, there have only been 18 documented hammerhead attacks ...

The great hammerhead is the largest of the nine identified species of this shark. It can grow up to 20 feet in length and weigh up to 1,000 pounds, although smaller sizes are more common.

Peter Klimley is a man who has held his breath and dived down 100 feet to hand-tag hammerhead ... reef shark, there are lots of different species and they all look alike. NOVA: Have you ever ...