The massive and well-known great hammerhead (Sphyrna mokarran) has the most distinctive hammer of its genus. It is particularly wide and virtually straight along the front edge, with just a small notch in the centre. The eyes are at either end of the hammer and the mouth is positioned on the underside in line with the trail edge of the hammer. The first dorsal fin is particularly tall, sickle-shaped and has a pointed tip. The second dorsal fin is also tall with a concave rear edge. The body is dark grey above fading to light grey below. The teeth are triangular and strongly serrated. Juveniles are similar but have a more curved hammer.
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