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Blue whales are found in all the world’s oceans . Some live in the northern Pacific and Atlantic . Others live around Antarctica . Many blue whales migrate during the year. For example, in the summer they may feed in cold waters near the poles. Then, in the winter they may move to warmer waters to mate.

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blue whale." Britannica Student Encyclopedia: An A to Z Encyclopedia, Encyclopaedia Britannica, 2015. Kids InfoBits, http://link.galegroup.com/apps/doc/GMVVNF103967062/ITKE?u=char92994&sid=ITKE&xid=edc55edb. Accessed 12 Apr. 2019.

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They eat tiny shrimplike creatures called krill . A single adult can swallow several tons of krill each day.

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A blue whale may be more than 100 feet (30 meters) long. It can weigh 150 tons or more. Its body is blue-gray, with lighter gray splotches. On the throat and chest are 80–100 long grooves. The grooves let the whale’s mouth stretch widely. Instead of teeth, the mouth contains a structure called baleen. The baleen has bristles that trap small prey.

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For many years, blue whales were hunted for their oil and body parts. They were close to extinction in the 1960s, when they became protected by law. Today the blue whale remains an endangered species .

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Scientists consider the blue whale to be the largest animal that has ever lived on Earth.

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Garbus, Julia, and Noah Berlatsky. "Whale, Blue." UXL Endangered Species, edited by Kathleen J. Edgar, 3rd ed., vol. 1: Mammals, UXL, 2016, pp. 248-250. Kids InfoBits, http://link.galegroup.com/apps/doc/CX3627500086/ITKE?u=char92994&sid=ITKE&xid=2d364868. Accessed 12 Apr. 2019.

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In the Antarctic, blue whales can grow up to 110 feet (33 meters), but they are smaller in the North Atlantic and North Pacific.

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The blue whale has a wide, U-shaped head and a dorsal (on its back) fin. Its body is slate blue in color. Sometimes, microorganisms accumulate on the whale's body, giving it a faintly yellow sheen.

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Blue whales are found in all of the major oceans. Most blue whales prefer cold waters and open seas. In summer, they inhabit subarctic and Antarctic waters, feeding on krill in the water of melting ice packs. In winter, they migrate to warmer waters near the equator, where they will mate. Some blue whales, however, do not appear to migrate, residing year-round in tropical coastal areas.

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Humans have hunted whales—such as the blue whale—for thousands of years. All parts of the animal were useful; one whale could provide nutrition, building materials, clothing, and even oil for lamps.it is thought that more whales were killed in the early 1900s than in the previous four centuries combined.The International Whaling Commission (IWC) ordered a moratorium (temporary halt) of whaling in 1982.

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Its average length is 82 feet (25 meters), but lengths of more than 110 feet (33.5 meters) have been recorded.

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Melissa and Brandon Cole. "Whales: Members of the Family." Whales, by Melissa Cole and Brandon Cole, Blackbirch Press, 2001. Wild Marine Animals. Kids InfoBits, http://link.galegroup.com/apps/doc/NEXALZ162967076/ITKE?u=char92994&sid=ITKE&xid=4458381a. Accessed 12 Apr. 2019.

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When a blue whale breathes, its blow (moist air forced out of the blowhole) can reach heights of 30 feet (9.1 meters).

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Blue whales are found in cold and temperate, or mild, waters worldwide. [direct quote!!!!!]

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They are blue-gray in color and have a small dorsal fin located about three-quarters of the way down their backs.

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"blue whale." The Columbia Electronic Encyclopedia™, Columbia University Press, 2018. Kids InfoBits, http://link.galegroup.com/apps/doc/A69016684/ITKE?u=char92994&sid=ITKE&xid=9a8830f4. Accessed 15 Apr. 2019.

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The Latin name for the blue whale is Balaenoptera musculus.

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Blue whales have been known to reach a length of 100 ft (30.5 m) and to weigh up to 200 tons (180 metric tons), but the typical size is about 70–90 ft (21–27 m) and 100–150 tons (90–135 metric tons). [ direct quote!!!! ] The blue whale is slate blue in color and has a dorsal fin. It is toothless and has fringed baleen, or whalebone, plates in its mouth, which act as a food strainer.

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The blue whale feeds mainly on krill, which are small, shrimplike shellfish. [direct quote!] Like all whales in its family, the blue whale uses the fringed baleen (whalebone) plates that line its mouth to strain krill from seawater.

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Blue whales are baleen whales that feed on krill.