Turtles, birds and crocodylians have genetic remnants of a ‘third eye’

Many lizards have a so-called 'third eye', more formerly known as a parietal or pineal eye, which is located smack dab in the middle of their heads. If you dissect a parietal eye, you'll see that it very much resembles a normal eye, with structures similar to a cornea, lens and retina, as well as a …

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