For those troubled by Chase No Face, the good-natured but facially disfigured kitty (link to potentially disturbing post), here’s an interesting unicorn chaser about the unicorn of the sea, the narwhal. National Geographic got dentist Martin Nweeia up to the Arctic to look into the male narwhal’s left tooth, which forms a unicorn-like tusk. In the video above, he examines a narwhal tusk up close and discusses its function. Note: If you are squeamish about seeing someone get dental work, you might need to skip this one, too, ya big wimp. (Video link, via National Geographic’s Wild Chronicles)