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some vertebrates have a third eye (a parietal eye). The eye is located at the top of the head, is photoreceptive and is associated with the pineal gland, regulating circadian rhythmicity and hormone production for thermoregulation.
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Fun Fact: some vertebrates have a third eye (a parietal eye). The eye is located at the top of the head, is photoreceptive and is associated with the pineal gland, regulating circadian rhythmicity and hormone production for thermoregulation.
Source
en.wikipedia.org
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