This ancient lizard may have watched the world through four eyes

A fossil of the monitor lizard’s skull reveals two holes for the photosensory structures

Saniwa ensidens

ANCIENT LIZARD  Four-eyed Saniwa ensidens, which lived 50 million years ago, closely resembled the modern monitor lizard Varanus mertensi, shown here with an overlay of the skull of S. ensidens.

A. Lachmann/Senckenberg Gesellschaft für Naturforschung/Digimorph.org

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