The tuatara, a lizard-like reptile, has three eyes! The third "parietal" or "pineal" eye is on top of the head.

Unlike normal eyes, this third eye is primitive, and cannot detect and identify shapes. Some scientists think that the eye may sense how bright the light is, helping tuataras regulate the amount of time they spend basking in the sun.

Tuataras are native to New Zealand and are thought to be the most ancient of all reptiles, dating back almost 200 million years to the Mesozoic, the beginning of the Age of Reptiles.

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