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Strictly a filter feeder, the whale shark strains plankton and small fish from the upper waters of tropical and subtropical seas by lying motionless beneath the water’s surface. Considered the largest living species of fish, a whale shark may measure more than 15(50 ft) in length and weight more than 18 metric tons. The whale shark posses little risk to humans; however, whale sharks have been known to ram boats that they have mistaken for rival sharks.