10 Things You Didn't Know About Narwhals

    Yes, they're real!

    1. Although they're referred to as unicorns of the sea, narwhals are very real.

    2. Their spiral tusks are actually teeth!

    3. They can be as big as a school bus.

    4. Each tooth can contain up to 10 million nerve endings.

    5. Narwhals are hunted for their skin and tusks.

    6. Narwhals are some of the world's deepest divers.

    7. Old narwhals are almost completely white.

    8. New research found that the bigger the tusk, the larger the testes.

    9. They use sound to find breathing holes in ice.

    10. Because they're so elusive, researchers have started tracking them to find out more about them.