The great hammerhead is the largest of the nine identified species of this shark. It can grow up to 20 ... They are gray-brown to olive-green on top with off-white undersides, and they have ...

Klimley: Yes. The U.S. Navy, in fact, once considered the hammerhead the third most dangerous species after the great white and the tiger shark. (There are nine species of hammerheads, but the ...