With its famous gigantic tooth — a spiral ivory tusk jutting from its upper lip — most people will never set eyes on a narwhal, the near mythical creature known affectionately as the unicorn of the sea.
From: By Jean Williams
https://www.ada.org/en/publications/ada-news/2018-archive/may/dentists-contribute-to-smithsonian-exhibit-book-on-narwhal
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