The bonnethead shark or shovelhead, Sphyrna tiburo, is a member of the hammerhead shark genus Sphyrna. Characterized by a broad, smooth, spade-like head, they have the smallest cephalofoil (hammerhead) of all Sphyrna. Grey-brown above and lighter on the underside, it is a timid and a harmless shark. On average, bonnethead sharks are about 3–5 ft (0.91–1.5 m) long, being one of the smallest hammerhead shark. This species lives in the Western Hemisphere where the water is usually warmer than 70 °F (21 °C). It ranges from New England, where it is rare, to the Gulf of Mexico and Brazil, and from southern California to Ecuador. During the summer it is common in the inshore waters of the Carolinas and Georgia; in spring, summer, and fall, it is found off Florida and in the Gulf of Mexico. In the winter, the bonnethead shark is found closer to the equator, where the water is warmer.