How The Devil Ray Got Its Horns

If you ever find yourself staring down a manta ray, you’ll probably notice two things right away: the massive, flapping fins that produce the shark cousin’s 20-foot wingspan and the two fleshy growths curling out of its head that give it the nickname “devil ray.” A new San Francisco State University study shows that these two very different features have the same origin — a discovery that reflects an important lesson for understanding the diversity of life. 

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