ZoomDinosaurs.com Tyrannosaurus rex

Introduction Fact Sheet Skeleton When T. rex Lived What T. rex Ate Hunting, Fighting

Discovery and Naming of T. rex Fossils T. rex vs. Giganotosaurus Intelligence, Care of Young Running Disease in T. rex Q. and A.

T. rex Myths Extinction Classroom Activities and Printouts Classification T. rex Web Links

When T. rex Lived

The Earth 65 million years ago.

T. rex lived during the late Cretaceous period, about 85 million to 65 million years ago, toward the end of the Mesozoic Era, the Age of Reptiles. During this time, the Earth was seismically active; there were many volcanic eruptions. The supercontinent Pangaea had broken up and the subcontinents Laurasia and Gondwana were drifting farther apart. There were no polar ice caps, the sea level was much higher than it is now, and the climate was warmer.

T. rex was among the last of the dinosaur species to evolve before the Cretaceous-Tertiary (K-T) extinction 65 million years ago. Among the contemporaries of Tyrannosaurus were Triceratops (which was probably preyed upon by T. rex), Ankylosaurus (an armored herbivore), Maiasaura (a plant-eater), Edmontonia (a plated dinosaur), Anatotitan (a duck-billed dinosaur), Pachycephalosaurus(a crested, plant-eating dinosaur), Parasaurolophus(a duck-billed dinosaur), Quetzalcoatlus (a huge flying reptile, not a dinosaur), Corythosaurus (a helmet-crested, duck-billed dinosaur), Styracosaurus, and many more bizarre creatures.

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