Extreme Dinosaurs ventures deep into prehistory to examine a vanished world. Learn how Tyrannosaurus rex hunted and scavenged, marvel at the mountain of flesh and bone that was Argentinosaurus, and experience the trials and triumphs of paleontologists past and present. Evolving and diversifying rapidly, dinosaurs dominated the Earth for more than 150 million years. Encounter the "terrible lizards" in all their glory, whether agile pack-hunters, bony-plated beasts, or tiny hatchlings. Also, discover how some dinosaurs evolved into birds, thus surviving the ultimate calamity—mass extinction.