Paleozoic Era
Life before the dinosaurs (541–252 million years ago): Anomalocaris, trilobites, Dunkleosteus, giant dragonflies, Dimetrodon and the first animals to walk on land.
Life before the dinosaurs (541–252 million years ago): Anomalocaris, trilobites, Dunkleosteus, giant dragonflies, Dimetrodon and the first animals to walk on land.
