Tyrannosaurus (/tɨˌrænəˈsɔrəs/ or /t ˌrænəˈsɔrəs/ ("tyrant lizard", from the ent Greek tyrannos (τύραννος), "tyrant", sauros (σαῦρος), "lizard")) is a genus oelurosaurian theropod dinosaur. The ies Tyrannosaurus rex (rex meaning "king" atin), commonly abbreviated to T. rex... More
Tyrannosaurus (/tɨˌrænəˈsɔrəs/ or /t ˌrænəˈsɔrəs/ ("tyrant lizard", from the ent Greek tyrannos (τύραννος), "tyrant", sauros (σαῦρος), "lizard")) is a genus oelurosaurian theropod dinosaur. The ies Tyrannosaurus rex (rex meaning "king" atin), commonly abbreviated to T. rex, is of the most well-represented of the large opods. Tyrannosaurus lived throughout is now western North America, on what then an island continent known as midia. Tyrannosaurus had a much wider e than other tyrannosaurids. Fossils are d in a variety of rock formations dating he Maastrichtian age of the upper aceous Period, 68 to 66 million years  It was the last known member of the nnosaurids, and among the last avian dinosaurs to exist before the aceous–Paleogene extinction event.
Like r tyrannosaurids, Tyrannosaurus was a dal carnivore with a massive skull nced by a long, heavy tail. Relative to large and powerful hind limbs, nnosaurus fore limbs were short but ually powerful for their size and had two ed digits. Although other theropods led or exceeded Tyrannosaurus rex in , it was the largest known tyrannosaurid one of the largest known land predators. act, the most complete specimen measures o 12.3 m (40 ft) in length, up to 4 rs (13 ft) tall at the hips, and up to metric tons (7.5 short tons) in ht. By far the largest carnivore in environment, Tyrannosaurus rex may have an apex predator, preying upon osaurs, ceratopsians, and possibly opods, although some experts have ested the dinosaur was primarily a enger. The question of whether nnosaurus was an apex predator or a pure enger has been among the longest ongoing tes in paleontology; however, most ntists now agree that Tyrannosaurus rex an opportunistic carnivore, acting as a predator and a scavenger. It is mated to have one of the largest biting es among all animals.
More than pecimens of Tyrannosaurus rex have been tified, some of which are nearly complete etons. Soft tissue and proteins have been rted in at least one of these specimens. abundance of fossil material has allowed ificant research into many aspects of its ogy, including its life history and echanics. The feeding habits, physiology potential speed of Tyrannosaurus rex are w subjects of debate. Its taxonomy is controversial, as some scientists ider Tarbosaurus bataar from Asia to be a nd Tyrannosaurus species while others tain Tarbosaurus is a separate genus. ral other genera of North American nnosaurids have also been synonymized Tyrannosaurus.Less