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Study finds T. rex was warmblooded, with human-like temperature

Researchers used fossil tooth chemistry to estimate the dinosaur’s internal heat, and three teeth showed an average of 97 degrees Fahrenheit, they said.

  • On Wednesday, a study published in Science Advances confirmed the Tyrannosaurus was warm-blooded, with an internal body temperature of about 97 degrees Fahrenheit, settling a long-standing paleontological debate.
  • Researchers at UCLA achieved this measurement by analyzing rare carbon-oxygen bonds in tooth enamel from Thomas, a 34-foot Tyrannosaurus, using techniques refined to require only milligrams of material.
  • This internal temperature helps explain how the apex predator maintained an active hunting lifestyle and thrived across diverse North American environments, including cooler regions like Alaska.
  • While the Tyrannosaurus's 97-degree temperature sits between cold-blooded reptiles and hotter avian descendants ranging between 104 and 109 degrees Fahrenheit, the data confirms the predator was endothermic.
  • Geobiologist Robert Eagle, who led the project for 15 years, hopes to apply this precise method to reveal metabolic details of avian dinosaurs and ancient mammalian ancestors next.
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According to a new study, T. Rex was definitely hot-blooded, hotter than a crocodile and colder than a chicken.

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Washington Times broke the news in Washington, United States on Wednesday, September 16, 2026.
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