January 2009
World Book Science Dataset;1/1/2009, p1
Reference Entry
Narwhal, a toothed whale found in arctic waters near Canada and Greenland. The male narwhal has a long, spiralled tusk. The tusk is formed by the upper left canine tooth, which grows forward instead of downward and protrudes through the skin. The tusk is sometimes found on females, and some narwhals have two tusks. A narwhal's tusk is as long as nine feet (2.7 m) and is used defensively against predators. Males also use the tusk to fight other males during mating season.


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