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Even hiding in this bush, with only its head showing, we can tell exactly what species this lizard is. What is it, and how do you know?

Answer:

This is a Green Iguana, and it is easily identified by the large scale on its neck. That scale is called the subtympanic scale, because it is below the tympanic membrane, which is the lizard's ear. You can see the ear located about half way between the eye and the subtympanic scale, and a little towards the back of the head.
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