READ LISTEN WATCH CHILD: Narwhals are mythical creatures related to unicorns. They have a magical horn that grants wishes and they love rainbows, and-- NARRATOR: No, no, no, no, that's not right. There are lots of misconceptions and mystery surrounding narwhals. Let's start with the horn. It's not a horn. It's the narwhal's left front tooth. And it's not growing out of the forehead. It grows out of the lip. Other animals have teeth or tusks that grow outside of the mouth, like elephants and walrus, but their tusks are curved. The narwhal tooth is the only straight tusk in the world. It's also one of the few teeth that is a spiral shape. The tooth grows in a counterclockwise spiral. And it is flexible and can bend a foot in any direction without breaking. But that's not all. The tooth is actually inside out compared to other animals. All the nerves are on the outside, which is a good reason that narwhals wouldn't want to use their sensitive tooth as ...