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The Narwhal's Left Tooth: The Narwhal Tusk Debate

Stashed in: Unicorns!, Under the sea!

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  Numerous theories have been presented over the centuries to explain the function or purpose of the narwhal tusk, the strangest tooth in nature: as a spear for hunting or a tool for digging, as a weapon of defense or aggression, an instrument for breaking ice or sound propagation, or even as a swimming rudder or an organ for breathing.

Perhaps Narwhals are the evolutionary descendent of unicorns?

narwhal unicorn

In all seriousness, it would be cool to have a horn.

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