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tyrannosaur
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Sue, a dinosaur fossil (Tyrannosaurus rex) Illustration of a Tyrannosaurus, a massive late Cretaceous predator with a large head, powerful jaws, and serrated teeth, shown alongside a car and people for scale comparison.
Person in inflatable T. rex costume lifting small dumbbells in a gym beside a weight rack; text overlay reads “design flaw?” with an arrow pointing to the T. rex's arms.
Tyrannosaurus rex tyrannosaur forelimb skeleton of Tyrannosaurus rex Illustration of Dilong paradoxus, a small, feathered early Cretaceous dinosaur with a long tail, slender limbs, and a pointed snout, shown in a running pose.
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Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
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Lion (panthera leo)
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Young chimpanzee dressed in a shirt and sweater vest, scratching his head thinking. (primates)
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Mute swan with cygnet. (birds)
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The bearded vulture (Gypaetus barbatus) is seen in Switzerland on December 2024
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tyrannosaur: References & Edit History

Article Contributors

Primary Contributors

  • Kevin Padian
  • The Editors of Encyclopaedia Britannica
    Encyclopaedia Britannica's editors oversee subject areas in which they have extensive knowledge, whether from years of experience gained by working on that content or via study for an advanced degree. They write new content and verify and edit content received from contributors.

Other Encyclopedia Britannica Contributors

Article History

Type Description Contributor Date
Modified link of Web site: National Center for Biotechnology Information - PubMed Central - A new tyrannosaur with evidence for anagenesis and crocodile-like facial sensory system. Aug 26, 2026
Add new Web site: NHS - Polycystic ovary syndrome. Mar 03, 2026
Noted the reclassification of the genus Nanotyrannus as separate and distinct from Tyrannosaurus rex. Oct 31, 2025
Media added. Oct 24, 2025
Add new Web site: ABC listen - The Science Show - Tyrannosaurs - more species found. Oct 01, 2025
Add new Web site: Cell Press - iScience - Morphological evolution and functional consequences of giantism in tyrannosauroid dinosaurs. Aug 20, 2025
Add new Web site: Scientific Reports - The phylogeny and evolutionary history of tyrannosauroid dinosaurs. Apr 14, 2025
Add new Web site: National Center for Biotechnology Information - PubMed Central - A new tyrannosaur with evidence for anagenesis and crocodile-like facial sensory system. Aug 18, 2024
Noted that a partial skull and lower jaw, which were discovered in 1983 and ascribed to Tyrannosaurus rex, were assigned to a new species called T. mcraeensis in 2024. Feb 23, 2024
Cross-reference added. Feb 09, 2024
Add new Web site: Prehistoric-Wildlife - The Tyrannosaurs: Dinosaur Predators. Oct 13, 2023
Added material about the purpose of the tyrannosaur's small forelimbs. Apr 14, 2022
Article revised and updated. Mar 14, 2022
Add new Web site: University of California Museum of Paleontology - The Tyrannosauridae. May 13, 2011
Text noting evidence of cannibalism in Tyrannosaurus rex added. Oct 22, 2010
New text added that describes the features of the genus Raptorex. Sep 21, 2009
Article restructured. Aug 17, 2009
Removed mention of Komodo dragon's infectious bite, as it was recently proven that Komodos kill using venom. Jul 01, 2009
Article revised and updated. Jul 27, 2006
Article revised. Sep 27, 2002
Article added to new online database. May 27, 1999
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