Reptiles and Amphibians Q&A 16

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In some lizards and the tuatara, the paired lateral eyes are augmented by another sense organ.

Question	Answer		Article
What is this organ?	The parietal eye.		Link to Article
What is the function of this structure?	The parietal eye detects shadows and, thus, perceives the potential threat of predators. It also serves as a dosimeter of light and, as such, helps regulate the diurnal basking activities of reptiles that possess these accessory light-sensitive organs.		Link to Article