The global species degenerates, and humans return to their ancestors. Dogs degenerate into wolves, cats degenerate into ancient cats, tigers degenerate into saber-toothed tigers, and pigs degenerate into giant pigs that can fight dinosaurs... Archeopteryx, Tyrannosaurus Rex, Titanoboa, Cang
Dragons, giant tooth sharks, brutal lions, imperial crocodiles, mammoths... the ancient creatures that once dominated the ancient earth are descending one after another, and the former rulers of the earth are about to return...