Bonnethead Bonnethead The bonnethead shark or shovelhead ("Sphyrna tiburo") is a small member of the hammerhead shark genus "Sphyrna", and part of the family Sphyrnidae. It is an abundant species on the American littoral, is the only shark species known to display sexual dimorphism in the morphology of the head, and is the only shark species known to be omnivorous. Characterized by a broad, smooth, spade-like head, it has the smallest cephalofoil (hammerhead) of all "Sphyrna" species. The body is grey-brown above and lighter on the underside. Typically, bonnethead sharks are about long, with a maximum size of about . Females
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