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Can tuatara see with their parietal eye?
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tuatara
The species is the sole living member of the reptile order Rhynchocephalia.
No, the tuatara cannot see with its parietal eye. Although the tuatara possesses a third, or parietal, eye on the top of its head that includes a rudimentary lens, it is not an organ of vision.1
Instead, the parietal eye is thought to serve an endocrine function by registering the dark-light cycle, which helps the animal with hormone regulation.1