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The diet of the blue whale consists of krill and plankton. The blue whale spends most of its time in the Arctic and Antarctic Oceans where it has plenty of food. In winter, it migrates to warmer waters in the tropics. However, plankton in the tropics is scarce and so at this time the whale must rely on its blubber for nourishment. In Arctic waters the blue whale feeds on three species of crustacean. It catches most of its food by diving. Sometimes it will go as deep as 1,650 ft. below the surface. When the whale rises it can feed by collecting the seawater in its mouth and straining out the plankton. Instead of teeth it has what are called baleen plates. The blue whale has a row of approximately 320 of these plates. These are 40 inches long and 22 inches wide. These are what the blue whale uses to strain out the food from the water. Long bristles on the ends of the baleen plates capture and hold the whale's food, which it then can lick off to eat.

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