Do Iguanas Have Three Eyeballs?

Sort of! Although it isn’t an “eyeball” in the classical sense, iguanas have a photosensory organ, called a “parietal eye,” at the top of their head that detects changes in sunlight, and is also integral to the production of hormones.

This “third eye” is mainly used as a circadian device to regulate the lizard’s sleep patterns, but also helps it manage body temperature and detect airborne predators by recognizing sudden shadows.

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