Explore the world of dinosaurs with the Smithsonian! From the mighty T. rex to the plant-grazing Triceratops, Smithsonian Jigsaw Journeys: Dinosaurs & Other Prehistoric Animals includes fascinating information about the creatures that roamed the earth during the Mesozoic Era. After reading about the discovery of Sue the T. rex , why Ankylosaurus was covered in spiky plates, and what caused the extinction of dinosaurs and other prehistoric animals, kids can complete the included puzzle to bring the dinosaurs to life.