Are you up for a quiz on Iguanas Eye Facts? Find why they evolved into having three eyes and more fascinating Iguana facts with TriviaSharp now! Read below Secret Fact About Iguana Third Eye below..
Most invertebrates have at least four eyes, to begin with. These are capable of detecting prey and threats. So why do vertebrates have only two eyes save for a few species like lizards, lampreys, and other reptiles/fish?
Invertebrates are small, swift movers, and generally hunt at night. On the other hand, vertebrates are flexible and have very few predators and natural threats given their size. The extra eyes help invertebrates to get a 360 view.
Vertebrates evolved past this constraint and have only two separate eyes that are capable of detecting prey and predators from afar. Most of the time, the eyes are set close together facing the same direction to give the animal a 180° panoramic view. While a few are capable of rotating protruding eyes to get a 360° view of their surroundings.
Yes, Iguanas really have three eyes! They are one of the very few vertebrates to possess a third eye. The third eye is scientifically called the parietal eye and is located on the top of the head. The eye is not photoreceptive, meaning, it is not capable of identifying images. So, what is the use of this eye?
The third eye in Iguanas or any other vertebrates for that matter is only capable of detecting movement, temperature, and partial light. The parietal eye in these exotic pets protects them from predators like birds. Birds are capable of snatching these arboreal animals from their habitat in one swoop.
The eye makes up for the lack of necks in these vertebrates helping them to see what is happening above them. The third eye in Iguanas lies camouflaged and flat on their skin. The lack of distinct pupils makes it difficult to identify the third eye from afar.
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