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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 ...

As one of the largest predators to have ever lived, megalodon captures people's imagination - and for good reason. But was this apex predator simply a beefed-up great white shark, and is it still ...