Green Iguana has a ‘third-eye’ called a parietal eye or pineal eye in the middle of its forehead that helps it to detect movement, light, and heat, necessary for their survival.
Green iguanas have a third eye, which is commonly known as the parietal eye. It is a photosensory organ that is connected to the pineal body (see definition below), which triggers hormone production and thermoregulation.
The pineal body according to Wikipedia, is a small endocrine gland in the vertebrate brain. The shape of the gland resembles a pine cone, hence its name. The pineal gland is located in the epithalamus, near the center of the brain, between the two hemispheres, tucked in a groove where the two halves of the thalamus join.
You can see the iguana’s third eye on the top of its head. Despite being called an “eye”, it cannot see the same as their actual eyes do, BUT it is an organ which is one of the reasons it is not recommended to use a white light for heat at night.
It also acts as a sensor for the object above it, that’s why you see it run when you try to get it from above.
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