I had vaguely remembered learning about these as a child, but my adult mind feared that I'd just read a story and taken a legend for real.

Fortunately, I finally decided to google the creature and am very happy to report that narwhals really do exist!

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QotD
Isn't the universe an amazing place? I wouldn't live anywhere else.
-- G'Kar, B5: Legend of the Rangers

(Thanks, Robert!)