It can grow up to three metres long. Narwhal tusks were once a highly sought-after commodity. They were often collected by Inuit and traded to gullible Europeans as actual unicorn horn, It’s possible ...

The most extraordinary feature of the narwhal is the long, spiral tusk which always has a left- handed spiral. No one is sure why it twists this way. The tusk, which measures up to 3m in length ...

The long, straight tusk with spiral indentations was unlike any animal ... European explorers reached the Arctic and came ...

Evidence suggests the narwhal and its spiral tusk may have inspired unicorn imagery. (Jesse Costa/WBUR) A photographic reproduction of a medieval tapestry on an adjacent wall featuring that horned ...

A narwhal’s tusk is actually a tooth ... they are the only straight tusks and the only teeth known to grow in a spiral. Stranger still, while most teeth (including human teeth) have a hard ...

Host Mary Jacobsen will interview Winchell about the distinctive characteristics of narwhals, sometimes known as “unicorns of the sea” because of the long spiral tusk protruding from their ...