Small animals called thecodonts and therapsids were the primary forms of animal life at the beginning of the:

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Thecodonts and therapsids were the primary forms of animal life at the beginning of the Triassic period, which lasted from approximately 252 to 201 million years ago. Thecodonts were a group of small archosaurs, which were ancestors of dinosaurs, crocodilians, and birds. Therapsids were a group of mammal-like reptiles that eventually gave rise to the first true mammals. The Triassic period was a time of significant evolutionary changes, including the emergence of dinosaurs, the first mammals, and the rise of coniferous forests.

Small Animals Called Thecodonts and Therapsids Were the Primary Forms