Tyrannosaurus Rex Was Warm-Blooded and Able to Live in the Arctic, Study Finds
A new study published in Science Advances reveals that Tyrannosaurus rex had a body temperature of approximately 97 degrees Fahrenheit, confirming it was warm-blooded. Researchers at UCLA analyzed isotopic signatures in tooth enamel from a famous specimen to obtain this precise thermodynamic measurement. This finding places T. rex in the same metabolic category as humans and large mammals, challenging previous assumptions about dinosaur physiology.
- ▪UCLA researchers determined that T. rex had a body temperature of roughly 36.3 degrees Celsius, similar to humans.
- ▪The study utilized isotopic analysis of tooth enamel from Thomas, a 66-million-year-old T. rex specimen found in Montana.
- ▪This research provides the first direct thermodynamic measure of a dinosaur's body temperature rather than relying on biomechanical estimates.
- ▪The findings suggest that T. rex possessed a metabolism comparable to modern large mammals and flightless birds rather than cold-blooded reptiles.
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Science Tyrannosaurus Rex Was Warm-Blooded and Able to Live in the Arctic, Study Finds It’s been 66 million years and science is still learning more about the most famous dinosaur. Joe Hindy Joe is a freelance journalist.… Read full bio Joe Hindy Read full bio September 16, 2026, 7:49 pm ET 3 min read Universal Pictures It was once widely believed that dinosaurs were all cold-blooded creatures, since they were classified as reptiles. But there is an increasing amount of evidence to the contrary, though scientists still don’t know the exact body temperatures of most dinosaurs. A domino in that discussion appears to have fallen, with a new study from researchers at UCLA that says the Tyrannosaurus rex had a similar body temperature to humans.
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