The third eye of some lizards

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: I would like to have informations for a school project about the third eye of some lizards. : Her are some of my questions: : 1. Wich of the lizards are easy to find (possibly in captivity) who have a third eye? (Only a few name will please me) : 2. Are there other lizards that the Tuatara that who are a rudimentary cristallin, a rudimentary retina and a nerve connected to the brain? : 3. What is the utility of the rydimentary cristallin if the "eye" doesn't need a focus because he don't see anything ? : 4. Were there any serious studies about the third eye ? : 5. Can we find illustrations of anatomy of the third eye ? : If yes, where I can find theme ? : 6. Were can I find more specific information about the third eye? : If you have any other informations about the subject I would appreciate. : Thank you for time consecrated to me. : : P.S. Sorry for my bad english, it's not my primary language.

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