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6-9'. Elongated, laterally compressed. Head laterally expanded: from above looks like a mallet, with large eye at each end of lateral expansion; tapered in side view, front edge arched. Back and sides gray; white below. First dorsal fin long, pointed, upper lobe of tail fin long, narrow, swept back. Mouth on underside of head.
Inshore and offshore waters to 900' deep; enters estuaries
Swift predator capable of quick maneuvers and has been known to attack humans.