The changing climate affected how animals were evolving also. Amphibians that had depended on the swamps for a moist habitat began to die out. They were replaced by the reptiles whose bodies could live in the very dry air and the wide changes in temperature. Pelycosaurs evolved from their beginnings in the Carboniferous. These animals look like a reptile, but have skull characteristics that make them more like a mammal. The most famous of the pelycosaurs is the Dimetrodon. Like many other pelycosaurs, Dimetrodon had a large sail on its back. The sail could have been used to help keep the body temperature stable.
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