Dinosaurs first made their appearance in the Late Triassic Period, about 201 million years ago. By then, life had existed only since the start of the Paleozoic Period, 340 million years before. Snakes first appeared in the fossil record during the early Cretaceous period, some 128.5 million years ago. Snakes and dinosaurs coexisted on earth … Continue reading Did Snakes Live At The Same Time As Dinosaurs?