page_title: Specimens of Tyrannosaurus
section_title: "Trix": RGM 792.000
hierarchical_section_title: Specimens of Tyrannosaurus / "Trix": RGM 792.000
caption_attribution_description: English: Presentation of the Tyrannosaurus specimen RGM 792.000 in the 2016-2017 exposition "T. rex in town" of the Naturalis Biodiversity Center, Leiden, the Netherlands. Français&#160;: Présentation du spéciment de Tyrannosaurus rex RGM 792.000, surnommé "Trix", pendant l'exposition "Un T-rex en ville" organisée par le Centre de la biodiversité Naturalis à Leyde, aux Pays-Bas, en 2016-2017.
context_page_description: Tyrannosaurus is one of the most iconic dinosaurs and is known from numerous specimens, some of which have individually acquired notability due to their scientific significance and media coverage.
context_section_description: In 2013, a team of paleontologists from the Naturalis Biodiversity Center (Leiden, Netherlands) traveled to Montana where they discovered and unearthed a large and remarkably complete Tyrannosaurus rex specimen that lived 67 million years ago. Black Hills institute collaborated with the team in the excavation. The bones were cleaned and assembled in a mount at Black Hills Institute's installations, with the help of both Chicago's Field Museum of Natural History and the Naturalis Leiden Museum. Chicago's Field museum sent digital models of their famous specimen, FMNH PR 2081 (Sue) to complete the cast and Naturalis museum replicated the bones using 3D-printing technology.
  The specimen was named Trix after former Netherlands' Queen Beatrix. At arrival in the Netherlands, it started touring on public display in an itinerant exhibition titled T. rex in Town. The first exhibit spanned from 10 September 2016 to 5 June 2017 and was set at the only room of the Naturalis museum open to public at the time (the 17th-century building known as Pesthuis), due to the fact that the museum was undergoing restoration. When the Netherlands exhibition ended, it continued travelling through other European countries in 2017, 2018 and 2019. As of August 2019, Trix was returned to display at the Naturalis museum where it is installed in a special room that was under construction during Trix's European tour.
  According to Peter Larson, director of Black Hills Institute, Trix is among the most complete Tyrannosaurus found. Between 75% and 80% of its skeletal volume was recovered.
  Trix's age has been estimated by counting the growth lines in the bones. Two different methods were used for this: An x-ray microtomography, which can be done without damaging the bones, and a small hole drilled in the fibula to allow comparison with the results of the x-ray-based technique. The growth lines were numerous, and difficult to distinguish. These facts alongside the roughness and rugosity of the skull are indications that this individual had reached an old age for a T. rex; in this case at least thirty years, as opposed to Sue's 28 years old (Sue was the oldest T. rex found before Trix's discovery), making Trix the oldest Tyrannosaurus known along with Scotty.
caption: Trix
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