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hammerhead
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hammerhead

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The hammerhead shark's name derives from the flattened projections at the side of its head. The eyes are on the outer edges of the projections. The advantages of this head design are not known; it may be that the shark's vision is improved by the wide separation of the eyes, or the head may provide extra lift by acting as an aerofoil.

Any of several species of shark found in tropical seas, characterized by having eyes at the ends of flattened hammerlike extensions of the skull. Hammerheads can grow to 4 m/13 ft in length. (Genus Sphyrna, family Sphyrnidae.)
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