The earliest known reptiles were small lizard-like animals, only a few centimeters long. They appeared about 330 million years ago, and are known to have lived in the rotted stumps of fallen trees. They probably fed on insects and other small creatures living in fallen trees. Reptiles quickly adapted to live in habitats that were not suitable for the amphibians. They spread across many parts of the Earth’s surface and developed into flying forms as well as many types of land-dweller.
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