Great hammerhead sharks (Sphyrna mokarran)—the funny looking big fish with the rectangular shaped head—have an unusual feeding habit. Unlike many other sharks, who rely on small and numerous prey, great hammerheads eat other sharks. A great hammerhead is seen among fish in Kicker Rock Islet near San Cristobal island, part of Galápagos archipelago on February 9, 2025. Comparatively, the same hammerhead would have to spend energy hunting one or two 2.2-pound fish every day to sustain itself. [ Related: Young hammerhead sharks love Biscayne Bay.