Climate forces adaption

An observation of how a rain forest animal, a lizard for example, would adapt due to climate change and its change of habitat, a desert for example. A rain forest lizard, which usually is bright green to match the leaves, would have to turn light to dark brown to match the sand in a desert, gaining tougher skin and a stricter appetite to survive the heat and harshness of the desert, showing how change of conditions force animals to adapt, or else they'll die.