If you lived in what is now Wyoming 49 million years ago, you could have spotted a four-eyed lizard—the one and only known example of such a creature among jawed vertebrates. The species, an extinct monitor lizard called Saniwa ensidens (above), had two standard eyes and also sported so-called pineal and parapineal “eyes” on the top of its head (shown as white dots in the reconstructed image below).
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