The eye is also connected to the tuatara’s pineal gland, which releases melatonin. Melatonin helps reptiles regulate heat. The tuatara’s parietal eye isn’t the only unique feature of this ...

Iguanas. Native to Central and South America, iguanas are a unique group of reptiles known for possessing a third "parietal" eye. Unlike their two primary eyes, which provide clear vision ...