page_title: Tyrannosaurus
hierarchical_section_title: Tyrannosaurus
caption_attribution_description: Photo: cast of a Tyrannosaurus rex braincase at the Australian Museum, Sydney.
context_page_description: Tyrannosaurus was a large predatory dinosaur from the Upper Cretaceous, 68 to 66 million years ago.
  Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Compared to the large and powerful hind limbs, its forelimbs were small, but powerful for their size. They had two clawed digits.
  There is discussion as to whether it was a hunter or a scavenger. Like most dominant meat-eaters of today, such as lions and hyenas, Tyrannosaurus might have been both. It had a very strong jaw, and its bite power could snap the bones of other dinosaurs.
  More than 30 specimens of Tyrannosaurus rex have been found. Some of them are nearly complete skeletons, and soft tissue and proteins have been reported in at least one of these specimens. Research is done on its biology, life history and biomechanics. The feeding habits, physiology and potential speed of Tyrannosaurus rex are some topics. Some scientists think Tarbosaurus bataar from Asia is a second species of Tyrannosaurus, but others think Tarbosaurus is a separate genus.
context_section_description: Tyrannosaurus was a large predatory dinosaur from the Upper Cretaceous, 68 to 66 million years ago. 
  Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Compared to the large and powerful hind limbs, its forelimbs were small, but powerful for their size. They had two clawed digits.
  There is discussion as to whether it was a hunter or a scavenger. Like most dominant meat-eaters of today, such as lions and hyenas, Tyrannosaurus might have been both. It had a very strong jaw, and its bite power could snap the bones of other dinosaurs. 
  More than 30 specimens of Tyrannosaurus rex have been found. Some of them are nearly complete skeletons, and soft tissue and proteins have been reported in at least one of these specimens. Research is done on its biology, life history and biomechanics. The feeding habits, physiology and potential speed of Tyrannosaurus rex are some topics. Some scientists think  Tarbosaurus bataar from Asia is a second species of Tyrannosaurus, but others think Tarbosaurus is a separate genus.
caption: Brain cast of Charles, at the Portobello Fossil Museum
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