A nar­whal’s horn isn’t a horn at all

World of Animals - - Real-life Uni­corns -

Known as the uni­corn of the sea, the nar­whal is one of the most iconic ‘horned’ crea­tures in the world. This medium-sized whale spends all year in the icy wa­ters of the Arc­tic, and its horn is ac­tu­ally a tooth. In males of the species, one ca­nine tooth grows up to 2.7 me­tres (8.8 feet) to form the spi­ralled tusk.

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