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I don't know about anyone else's experiences, but in regards to leaning over the iguana, that posture is what predators do just before they gobble you up. I believe that it is a survival reaction and that the reaction can be lessened or extinguished as the iguana ages and gains trust in the behavior of humans that it deals with daily.
That, and I had mine bite me on the nipple once when I had to lean over him to check his overhead lamp. Thank goodness I was wearing loose clothing.
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