Frogs are cold blooded animals. This means that they need heat to keep up their body temperature. If the temperature outside is cold, amphibians will not be active. Amphibians can get heat from the sun, usually indirectly: whereas reptiles can bask in the sun, amphibia usually do not, because it dries their skin. Some frogs aestivate during winter or during droughts. They usually look for underground place to aestivate. These include burrowing in muds and holes. They survive by getting oxygen through their skin. They come out when the weather outside is favourable.