Tyrannosaurus Rex 3D Screensaver - Version 1.0 Travel back to the Jurassic to discover the infinite variety of prehistoric life! Watch Tyrannosaurus Rex in all its glory roaming around the jungle, its mighty roar sending chills down the spine. Herbivorous dinosaurs are grazing in the distance; small predators are prowling for prey, and the Pterodactyls are flying over the ancient scenery, all of them making you believe that the Jurassic period is happening now, on your desktop.