Tail on Narwhal the puppy's head might have been vestige of a parasitic twin
“I would die for Narwhal,” a number of Twitter commenters pledged.
The likeliest explanation for how Narwhal got his face tail is not all that cute, said Margret Casal, a professor at the University of Pennsylvania School of Veterinary Medicine. The tail is probably Narwhal’s parasitic twin. But after looking at the photos and X-ray, he said, “It looks like some weird outgrowth of skin. Although something so large and strange would be most unusual.”
But it’s not unheard-of. In one case, a puppy had an extra pair of hind legs growing from its belly. Parasitic twins, like conjoined twins, can occur in humans, too. Wallach had a pet two-headed snake named Brady & Belichick that grew to healthy adulthood. Both heads ate normally. But the head that finished eating its mouse first would then attack and chew on the other head, as Wallach described in his 2012 paper, “Two-headed Snakes Make High Maintenance Pets.”
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