Narwhal tusk

Original narwhal tusk.

Scientific name: Monodon monoceros

Unicorns of the sea
We now know that the ‘unicorn horns’ traded across Europe for centuries actually came from a small Arctic whale called a narwhal.Male narwhals have asingle large tooth emerging from the front of their heads. Known as a tusk, it can grow up to three metres (10 feet) long.