Unicorns pranced all over Twitter Sunday as users celebrated an imaginary holiday for an imaginary creature. But some Twitter folk weren't in the mood for make-believe.
After all, who needs unicorns when majestic, spear-headed animals actually exist?
Case in point: the narwhal. The Arctic whale's spiral tusk can grow to more than nine feet long. It's also extremely sensitive, with up to 10 million nerve endings inside.
Image: KRISTIN LAIDRE/NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION
