"That's not a playful mammal … that's a predator." Onlooker captures ominous moment mysterious creature surfaces above water: ...

The first hammerhead shark was likely the result of a genetic deformity. A biologist explains how shark DNA reveals hammerheads’ history.

Divers on a shallow checkout dive in the Galapagos Islands were surprised to see two large and curious hammerhead sharks show up. As the divers rested on the sand and watched the fish and the sea ...