Great Hammerhead Sharks are known to hunt at dawn and at dusk. They feed on crustaceans like crabs and lobsters, molluscs like squids and octopuses, bony fish like tarpon, sardines, herrings, sea catfish, toadfish, porgies, jacks, croakers, groupers, flatfish, boxfish, and porcupine fish. They also eat other sharks like smoothhounds and grey reef sharks. Great Hammerhead Sharks have been known to eat others of their kind.