Title: 
Headings: What Is a Narwhal?
Wonder of the Day #489
What Is a Narwhal?
Have You Ever Wondered...
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Content: It can grow up to almost 10 feet in length with a distinctive spiral shape. Female narwhals also have a similar tusk that's much shorter and straighter. A narwhal's right incisor is normally small, but occasionally it also grows out. These “two-horned" narwhals are very rare. Scientists aren't completely sure what purpose narwhal tusks serve. At one time, people believed they might be used to break ice or spear fish. Further study has shown, though, that they're most likely used in mating rituals to impress females or battle rival males. Narwhals feed on fish that swim deep under the Arctic ice. In fact, narwhals are known for making some of the deepest dives of any marine mammal. Narwhals have been known to dive to depths of over 2,500 feet over 15 times per day, with some dives reaching as deep as almost 5,000 feet!