The finding supports the idea that T. rex was a fast, energetic predator and scavenger, not an animal that basked in the sun to gain energy like most modern-day reptiles.
Previous studies have already suggested that T. rex and its relatives were warm blooded, but now scientists have estimated the dinosaur's body temperature for the first time by studying different isotopes, or forms, of the same chemical elements in the enamel of three T. rex teeth from specimens found in the Hell Creek Formation in Montana.
One of the T. rex teeth used to measure the body temperature of T. rex, which involved using a dental drill to remove some enamel and dissolved the resulting powder to release carbon dioxide gas (Image credit: UCLA)
By measuring the bonds in carbon dioxide (CO2) given off when dissolving small samples from the T. rex teeth, Randon Flores, a geologist at the University of California, Los Angeles (UCLA), and his colleagues could estimate where on the scale of animal body temperatures T. rex sat.
"The temperature is about what I would have guessed — higher than a reptile or a slow mammal like a sloth, but lower than an avian," study co-author Robert Eagle, a geobiologist at UCLA, said in a statement.
Related storiesThese findings have implications for how and where the T. rex might have lived. A warm-blooded T. rex would have been an energetic, active animal, chasing or scavenging food to fuel its fast metabolism rather than basking in the sun to gain energy, wrote the authors.
The ability for T. rex to inhabit cooler, high latitudes also aligns with recent evidence that tyrannosaurs crossed the Bering Land Bridge between Asia and North America, write the authors.
How much do you know about the king of the dinosaurs? Test your knowledge with our T. rex quiz!
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