Between 65 - 90 million years ago, during late Cretaceous period, the dangerous, carnivorous Tyrannosaurus-Rex ruled the Earth. Let this screen saver take you on a voyage into the past... A group of Ornithomimus has gathered in swampy area to quench their thirst. Suspecting nothing, they saunter about the swamp in the afternoon sun. A little ways off, a monstrous T-Rex has picked up their scent.