The cephalofoil of the Great Hammerhead Shark is said to be used to pin stingrays down, because one Great Hammerhead Shark was found attacking a southern stingray in the Bahamas; the Great Hammerhead Shark first pinned the stingray down by hitting the stingray with its cephalofoil, and then it grabbed the stingray in its jaws and started to rip apart the stingray by shaking its head rapidly. Another Great Hammerhead Shark was found attacking a spotted eagle ray in open water; the Great Hammerhead Shark first bit off one of the ray's pectoral fins, and then pinned the ray down with its cephalofoil, and then ate the ray head-first.