- A large hammerhead with a notch at the center of head; 1st dorsal fin
moderately high, 2nd dorsal and pelvic fins low; front margin of head
broadly arched with prominent median notch. Uniform grey, grayish
brown, or olivaceous above, shading to white below; pectoral fins tipped
with grey or black ventrally. Attains 4 m.

- Carnivorous, fishes and shellfishes. Marine, juveniles nursing in coastal
areas. Overfishing.

- circum-tropical.