While gecko's are like chameleons,

While gecko's are like chameleons, in that they can change color, they do it for different reasons. Geckos try to blend in, not only to avoid predators, but also, to catch prey. Chameleons do it to communicate or convey emotions and result in becoming even more conspicuous. The color change occurs when cells with different color pigments beneath the lizard's transparent skin expands or contracts. If only we humans could do that!