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Green iguanas have third eyes on their top head.

Green iguanas averaging around 6.5 feet long and weighing about 11 pounds. They have a row of spines along their backs and along their tails which help them to protect from predators. Iguanas’ stout build gives them a clumsy but look but they are fast and agile on land. They have strong jaws with razor-sharp teeth and sharp tails which make up half their body length and can be used as whips to drive off predators. 

Green iguanas have a well-developed dewlap which help to regulates their body temperature. Apart from that, this dewlap used in courtships and territorial displays. Green iguanas breeding using dry season and male display more dominant. Females lay clutch of 20 to 71 eggs once per year and they give no pariental protection after egg laying. 

Green iguanas have a white photosensory organ on their head called the parietal eye. It is also called the third eye, pineal eye and pineal gland. This eye cannot form images but is sensitive to changes in light and dark and can detect movement. This help green iguanas to detect predators stalking it from above. Apart from that, iguanas have excellent vision enabling them to detect shapes and motions at long distances. They have cells called ‘ double cone cells’ that give these lizards sharp color vision and enable them to see ultraviolet wavelengths

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