Why reptiles take sun shine?

Like all reptiles, lizards are cold-blooded. Cold-blooded means that the lizard can not generate its own heat. Mammals are warm-blooded, meaning we can generate our own heat and maintain body temperature levels at a perfect condition without having to use something else to keep us at a good temperature range. Lizards go in the sun so they can warm themselves because their blood cannot maintain heat to keep the body from freezing.