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| The parietal eye of Anolis carolinensis can be seen on top of its head. |
Chester Zoo recently announced the arrival of tuataras – a group of reptiles they describe as one of nature’s “greatest marvels” having lived on the planet for around 200 million years, since before dinosaurs existed – which have “three eyes”.
In nature, there exist some animals that … biology textbooks writers are referencing [to having] a “third eye”. This light-sensitive organ is found in many animals, including lots of lizards, as well as some frogs and fish.