Ironically, the last emotion you feel when you see a school of 400 hammerhead sharks is fear. Hammerheads are very sensitive to noise, so they're wary of divers and very difficult to get close to.

Hammerhead sharks are consummate predators that use their oddly shaped heads to improve their ability to find prey. Their wide-set eyes give them a better visual range than most other sharks.

A hammerhead shark was spotted swimming chillingly close to beachgoers in St. Petersburg just one day before two life-altering shark attacks along Florida's Gulf Coast. The video, captured by ...