The thing is, it looks like an iguana. Could it be a false chameleon? A quick Google search shows that opinion is split as to whether iguanas can change colors on the spot or not. Whatever the explanation, this particular lizard changed the upper half of his body bright red when he climbed up this tree, right before my very eyes. I had just parked my car (I park under this tree every day) and remembered that my camera was on the back seat, so the timing was lucky.