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National Geographic : 1974 Nov
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Incredible inedible: Pardachirus dangles from a plastic line (above), while two sharks circle in a tank at Elat, Israel. The sharks find vibra tions caused by the wriggling fish almost irresistible; one speeds in for a feast. But sole food it isn't! Bumping the fish (below), the shark encounters an invisible cloud of poison emitted by its intended meal. Thick white membranes close over the attacker's eyes as it enters the zone affected by the secretion. Appetite overcoming repulsion, another would-be diner tries to take a bite (right), but seems unable to close its jaws. In convulsion the shark streaks away, frantically shaking its head and leaping and thrashing about the tank. The vio lence knocks loose a hitchhiking remora from the shark's underside. Seventeen hours later, after re peated attack attempts, the sole bears not a scratch. 722
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