• Etymology – “tyranno” means tyrant in Greek; “saurus” means lizard in Greek, and “rex” means “king” in Latin.
  • Huge predatory dinosaurs with small arms and two-fingered hands
  • T. rex fossils are found in western North America, from Alberta to Texas.
  • T.rex lived at the very end of the Late Cretaceous, which was about 90 to 66 million years ago.
  • T. rex fossils are found in a variety of rock formations dating to the Maastrichtian age of the upper Cretaceous period, which lasted from 67 million to 65 million years ago, toward the end of the Mesozoic Era.
  • The largest and most complete T. rex skeleton ever found was nicknamed Sue, after its discoverer, paleontologist Sue Hendrickson.
  • Measurements of Sue
    Height from hip -4 m (the beast’s highest point since it did not stand erect)
    Length – 12.3 m) long
    Weight -9 tons (about 8,160 kilograms).
  • Strong thighs and a powerful tail counterbalances its large head and allowed it to move quickly.
  • Two-fingered forearms were puny.
  • The king of dinosaurs needed thick neck muscles to hold up its large skull and power its forceful bite. Neck and arms muscles compete for space in the shoulder, and it appears that the neck muscles edged out the arm muscles.
  • T. rex had the strongest bite of any land animal that ever lived (57,000 Newtons)
  • T. rex had a mouth full of serrated teeth; the largest tooth of any carnivorous dinosaur ever found was 30 centimeters long.
  • Trex went extinct during the K-T mass extinction, about 65 million years ago. … This extinction was probably caused by a catastrophic asteroid colliding with Earth. It is thought that a an asteroid 4-9 miles (6-15 km) in diameter hit the Earth off the coast of Mexico.