Author: Carolyn Gramling / Source: Science News
About 50 million years ago, a monitor lizard in what is now Wyoming perceived the world through four eyes.
Saniwa ensidens is the only known jawed vertebrate to have had two eyelike photosensory structures at the top of the head, in addition to the organs we commonly think of as eyes, researchers report April 2 in Current Biology.The structures are called the pineal and parapineal organs. Among animals alive today, only the jawless fish called a lamprey has both…
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