Archosaurs, or ¨ruling reptiles,〃 first appeared during the Triassic, a period in Earthˇs history that lasted from 251 to 200 million years BC. Some archosaurs would have gradually abandoned the ¨crawling〃 stance, characterized by the belly hugging the ground and legs attached to the sides of the body (like modern crocodiles).

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TOP19706770

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達志影像

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