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Narwhal

Unicorns of the sea. These Arctic whales have a unique tusk that protrudes up to 10 feet from their head. Oddly enough, this tusk isn't used for hunting or icebreaking, but simply to attract females (although that can be considered a form of icebreaking in itself). Narwhal travel in packs, feeding on cod, halibut, and shrimp.