What's happened
Scientists have used fossil-teeth chemistry to estimate Tyrannosaurus rex’s body temperature at about 97°F (36°C), placing it among warm-blooded animals and offering new insight into its metabolism. The finding, published in Science Advances, shows T. rex could maintain a stable internal temperature across varied environments.
What's behind the headline?
Critical analysis
- This finding reinforces the warm-blooded model for large dinosaurs, narrowing the range of possible metabolic rates.
- The method relies on interpreting chemical patterns in enamel, which may be sensitive to post-mortem changes and requires cross-validation with other lines of evidence.
- If corroborated across more species, this approach could recalibrate reconstructions of dinosaur ecology and energy budgets.
Brief
- The study provides a specific temperature reading for T. rex, suggesting it ran like large mammals rather than cold-blooded reptiles. This has implications for its hunting strategies and geographic range.
- Future work should test the technique on additional species and compare with other metabolic indicators to confirm robustness.
How we got here
Researchers have long debated whether dinosaurs were warm or cold-blooded. New methods analyze enamel chemistry in teeth to infer body temperatures, offering a direct estimate for T. rex and helping deduce its lifestyle and prey needs.
Our analysis
Associated Press and UCLA researchers report the same core temperature using enamel chemistry; The Independent and AP News carry the same findings, with corroborating quotes from scientists such as Jasmina Wiemann and Aradhna Tripati.
Go deeper
- What does this imply about T. rex’s prey choices?
- Will the method be applied to other dinosaurs to map metabolism widely?
- How might this reshape how we picture dinosaur ecosystems?
More on these topics
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University of California, Los Angeles - Public university in Los Angeles, California
The University of California, Los Angeles is a public research university in Los Angeles, California. UCLA traces its early origins back to 1882 as the southern branch of the California State Normal School.
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Science Advances - Peer-reviewed journal
Science Advances is a peer-reviewed multidisciplinary open-access scientific journal established in early 2015 and published by the American Association for the Advancement of Science.
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Tyrannosaurus rex - Dinosaur
Tyrannosaurus () is a genus of large theropod dinosaur. The type species Tyrannosaurus rex (rex meaning 'king' in Latin), often shortened to T. rex or colloquially T-Rex, is one of the best represented theropods. It lived throughout what is now western North America, on what was then an island continent known as Laramidia. Tyrannosaurus had a much wider range than other tyrannosaurids. Fossils are found in a variety of geological formations which have been dated to the late Maastrichtian age of the late Cretaceous period, 69 to 66 million years ago, with isolated specimens possibly indicating an earlier origin in the middle Campanian age. It was one of the last known members of the tyrannosaurids and among the last non-avian dinosaurs to exist before the Cretaceous–Paleogene extinction event. Like other tyrannosaurids, Tyrannosaurus was a bipedal carnivore with a massive skull balanced by a long, heavy tail. Relative to its large and powerful hind limbs, the forelimbs of Tyrannosaurus were short but unusually powerful for their size, and they had two clawed digits. The most complete specimen measures 12.3–12.4 m (40–41 ft) in length, but according to most modern estimates, Tyrannosaurus...
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Johns Hopkins University - Private university in Baltimore, Maryland
The Johns Hopkins University is a private research university in Baltimore, Maryland. Founded in 1876, the university was named for its first benefactor, the American entrepreneur, abolitionist, and philanthropist Johns Hopkins.
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Associated Press - News agency company
The Associated Press is an American not-for-profit news agency headquartered in New York City. Founded in 1846, it operates as a cooperative, unincorporated association. Its members are U.S. newspapers and broadcasters.