I photographed this same tree frog some weeks ago and posted the photo on Facebook. At the time I thought he was an ordinary tree frog with four legs but one was under him to break his fall/jump to the siding. Tonight I saw him again and decided to take a photo when I noticed that he in fact only has three legs. We prompted him to jump and sure enough he struggled with only three legs. This is not the ordinary configuration and I feel for him. I suppose an "enemy" almost got him some time ago.