No evidence has ever been found that sharks prefer humans to their regular diet of fish. Nor has it been scientifically established that they attack wounded or bleeding people more readily than the unwounded. Biologists are not even sure why sharks attack humans, although they do believe that people emit irregular low-level frequencies and odors that resemble those of wounded fish. They are opportunistic eaters (especially the rapacious tiger shark) and have also been known to eat turtles, seagulls, and tin cans. Even submarines have been attacked, and fiber-optic cables on the ocean bed have
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