I found a "gray" tree frog "hiding" on one of my weathered bronze sculptures. The dominant color of the piece is a muted bronze. The tree frog was a rather bright green. These guys and gals change color like a chameleon. I laughed and told the little guy that his camouflage sucked, then moved him/her to a nearby tree upon which he/she gradually changed color to match the bark in about 4-5 minutes. (wild guess) He/she(?) saw only the subtle green tones in the patina and changed to what he/she could see. Which likely means that the tree frog is color blind to certain spectra. Anyone up on colorblindness in amphibians, and specifically in tree frogs? Or, was the mistake because they can only change in a range from grey to green, and he/she was trying to approximate? Or, should we consider extra-ocular vision, wherewith the frog's skin acts as a sense organ which potentially replaces the need for this specific ocular vision?