Come along with Ackerley the Acanthostega to visit the Triassic and Jurassic periods, 203-145 million years ago. Watch the first dinosaurs appear. See them grow in size and numbers to dominate on land, in the air, and in the oceans. Discover the facts, fossils, and fun science behind Earth's earliest dinosaurs, as well as flying reptiles, mighty sea beasts, and the first birds. This second part of the exciting story of life on Earth unfolds through amazing lifelike illustrations and fascinating diagrams, all narrated by a friendly prehistoric guide.