An iguana it is. This one had braved three yards with multiple dogs to end up on the AC unit. My neighbor, Christine, who had absolutely no fear of picking her up, thought it may have been someone's pet at one time. But being the iggi was over 3 feet long, none of us were able to take care of it so we released it at a local park that is on a canal where others of its ilk were observed. Hopefully all will be well.