Interesting facts about lizard body colour : The ability to change one’s skin colour is an extremely useful trait. Some species use dynamic changes in pigmentation to signal to potential mates or rivals. Others use it to camouflage themselves to fit in with their surroundings and avoid predators. Colour change can also assist in body temperature regulation by allowing for greater (or lesser) amounts of heat absorption as required. This last function is especially important in ectotherms, organisms that rely almost exclusively on external sources of heat to maintain an optimal body temperature.