Awesome Ancient Animals follows the evolution of animals. Huge Hunters Roam the Earth takes you back to the Tertiary Period. During this time, great open plains of grass formed. Mammals from this time developed long legs to suit this new environment.
"Describes some of the animals of the Jurassic Period, a time when dinosaurs reached their biggest sizes. Includes an Animal Families glossary, prehistory timeline, and pronunciation guides"--
"Describes the animals of the Paleozoic Era, when animals with bony parts and the first land animals developed. Includes an Animal Families glossary, prehistory timeline, and pronunciation guides"--