Reptiles have one eye {median eye}| to detect infrared light. Later, median eye evolved to become pineal gland.
In reptiles, skull front-middle eye {parietal eye}| {third eye} detects sunlight level, regulates daily activities, and regulates seasonal responses to light and temperature. Parietal-eye light level affects puberty, sexual activity, hibernation, and aestivation.
4-Zoology-Kinds-Reptile-Anatomy
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Date Modified: 2022.0225