Chameleon-frog

We ran across this gray treefrog, Hyla versicolor, on a recent outing. It sits, green and gargoylelike, on a leaf. While the animal matches its background fairly well, it seems to have been misnamed - it's hardly gray!

However, when the frog clambers up the bark of a tree, it slowly shifts its coloration to match the woody substrate. Very effective camouflage, I'd say.