Unicorns of the SeaNarwhals might just be the absolute coolest animals on the planet.Famed for their long, protruding tusks, these aquatic mammals have long fascinated humans both in ancient and contemporary times. Even today, we know relatively little about narwhals, the medium-sized whales native to the Arctic. Perhaps that, along with their other-worldly tusk, is what makes them so fascinating.Though the spiraled tusks are predominantly a feature of male narwhals, some females have been found to have them. In the past, researchers believed that the tusks served as weapons, but nowadays, science points towards the narwhal's most identifiable feature as a sensory tool used in navigating the icy waters of the Arctic.Known to the Inuit peoples of northern Canada and Greenland for over a thousand years, the European "discovery" of the whales led to increased mythology. Their isolated habitats, evasive manners, and inability to survive in captivity have kept them, to this day, one of the most mysterious creatures on Earth.