Chameleons don't just change colors, they also glow.
And prettily at that! This reminds me of how the male peacocks have more vibrant colors than the female. But this is even more interesting in that there is a level of subterfuge employed during the mating season to avoid predators. Fascinating how two survival needs are met in one by the fluorescent mechanism - finding mates and avoiding predators.
Nature always seems to find very elegant solutions.