Thanks for the feedback! I'm a noob and just now kinda starting to get a good grasp on aperture / DOF.
I was definitely playing with selective color, but in the case of this particular image, I think it's an enhancement. The piece of metal the lizard is perched on is part of a cover for a large Cummins/Onan generator that had been broken into by a copper thief. The color this metal is painted, Onan green, is not too far from the lizard and clashes a bit.