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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.

There are 10 species of hammerhead shark, with the largest being the Great Hammerhead, which grows up to 20 feet, experts say. Shark attacks are rare, and hammerhead attacks even more so ...