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Definition of WHALE SHARK
: a shark (Rhincodon typus) of warm waters that has small teeth, feeds chiefly on plankton strained by its gill rakers, may sometimes attain a length of up to 60 feet (18.3 meters), and is the largest known fish
Species (Rhincodon typus) of gigantic but harmless shark found worldwide but mainly in the tropics. The largest of living fishes, it often grows to about 30 ft (9 m) long and may reach twice that size. It is gray or brown with a pale undersurface and is distinctively marked with small spots and narrow vertical lines of yellow or white. It has tiny teeth, and eats plankton and small fishes. A sluggish animal, it generally swims slowly near the surface and has been hit by ships.