Discovering Dinosaurs: The Ultimate Guide to the Age of Dinosaurs

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Discovering Dinosaurs: The Ultimate Guide to the Age of Dinosaurs by Bob Walters & Tess Kissinger Dinosaurs are a diverse group of reptiles of the clade Dinosauria. They first appe ared during the Triassic period, between 243 and 233.23 million years ago (MYA), although the exact origin and timing of the evolution of dinosaurs is the subject of active research. Why did some dinosaurs have massive bodies and long necks? What made Tyrannosaurus-Rex so fearsome? Travel back to the dinosaur age to learn about how the biggest, heaviest, and fiercest creatures on Earth lived. Stunning illustrations bring these creatures to life. Show more