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Do iguanas have a third eye
Bashny.Net
At the top of the head of green iguana is a photosensitive body, acting as the "third eye." However, seeing that the eye can not, because the lens and the retina is underdeveloped, but is able to capture the movement and change of illumination. This "eye" is very useful for iguanas, because it helps to escape from predators that could attack the top.
via factroom.ru
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