"A parietal eye, also known as a parietal organ or third-eye or (often but less correctly) pineal eye, is a part of the epithalamus present in some animal species. The eye may be photoreceptive and is usually associated with the pineal gland, regulating circadian rhythmicity and hormone production for thermoregulation.[1]"
-http://en.wikipedia.org/wiki/Parietal_eye
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