The Narwhal (Monodon monoceros) is an arctic whale, very similar to the Beluga whale. Both have the same body shape, the "melon" at the front of the head, a finless back. The differences are mainly in the coloring, whereas adult belugas are white, the narwhals are mottled.
The most striking feature lacking from the beluga though is the tusk that male narwhals sport. It originates from the upper part of the left jaw into a spiral helix that can be up to 3 meters long.
In medieval times, narwhal tusks were sold as unicorn horns, fetching their weight in gold. It seems that the spiral tusk were the origin of the unicorn myth, not unlike how dinosaur fossils gave rise to dragon myths around the world.
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