Narwhal | American Cetacean Society: "The narwhal is a medium-size odontocete, or toothed whale. Some people think that its long, spiral tusk is the source of the myth of the unicorn. It has a thick layer of blubber and no fin on its back, which make it possible for the narwhal to live in the extremely cold waters of the Arctic and to move freely under ice. "
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