27 dinosaurs from the Triassic, Jurassic, and Cretaceous periods. See these fabulous creatures that ruled the land and sea for millions of years. Included in this screen saver are images of Iguanodons, Triceratops, Tyrannosaurus Rex (T-Rex), Velociraptor, Ankylosaurus, Aptosaurus, Barapasaurus, Brachiosaurus, Compsognathus-longipes, Dilophosaurus, Elasmosaurus, Hadrasaurs, Liopleurodon, Maiasaura, Ornithocheirus, Polacanthus, Pterodactyl, Polacanthus, Prenocephale, Pteranodon, Scipionyx, Spinosaurus, Stegosaurus, Styracosaurus, Parasaurolophus, and Utahraptor.