Now we know more about how narwhals use their tusks (New York Times article). And I learned that there is such a thing as a double-tusked narwhal.
I always liked these creatures, just like the unicorn tales they inspired. A whale with a long spiraling horn seems only slightly less romantic (in the fairy-tale sense, not the love sense) than a horse with one. I'd love to see them in person--if only they didn't insist on living in such darned cold climates. There ought to be a Gulf Coast species of narwhal. The nar-y'all?