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Found in the Arctic and North Atlantic Oceans, the narwhal is small whale known for the single, tightly spiraled tusk—up to 9 ft (2.7 m) long—that protrudes from the upper jaw of males as well as some females of the species. The tusk is an overgrown, nerve-rich incisor tooth and may be used as a sense organ or to attract mates. Now hunted by native peoples for its meat, the narwhal was formerly killed for its tusk, which was believed to have magical properties and was sold for centuries as what? Discuss
Source: The Free Dictionary