Scientists Measured Tyrannosaurus Rex Body Temperature
Researchers analyzed fossilized teeth to determine the metabolism of the prehistoric predator.
Updated on Sept. 29, 2026 in Geology
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Scientists have determined that the Tyrannosaurus rex maintained a body temperature of 97 degrees Fahrenheit. This temperature measurement suggests that the T. rex was endothermic, meaning it could regulate its own internal heat.
Why it matters
Determining the metabolic state of T. rex helps paleontologists understand the biological capabilities of these apex predators. This evidence clarifies how massive dinosaurs survived and interacted with their environments.
Researchers drilled tiny holes into fossilized teeth obtained from the Natural History Museum of Los Angeles County to analyze the chemical bonds between rare elements. This method allowed for a precise calculation of the organism's internal temperature.
The players
Natural History Museum of Los Angeles County
This institution provided the fossilized teeth used as the primary samples for the scientific temperature analysis.
Thomas
Thomas is the name of the specific Tyrannosaurus rex skeleton that provided the teeth for this metabolic study.
The details
To conduct the study, scientists examined two teeth samples from a T. rex skeleton known as Thomas. By measuring the chemical bonds between rare isotopes, the team successfully calculated the internal heat of the animal.
Timeline
September 2026: The study reporting the T. rex body temperature was published.
The Big Picture
This finding marks a major departure from the legacy hypothesis that dinosaurs were strictly cold-blooded reptiles. It bridges the gap between historical paleontology and modern biology by confirming that large predatory dinosaurs maintained high internal temperatures.
This research potentially changes how we perceive the movement, growth, and hunting behaviors of dinosaurs in modern visual media and exhibits. By providing a baseline metabolic rate, it sets a standard for future studies on other prehistoric species.
The takeaway
The study proves that the T. rex was a biologically active creature capable of internal thermal regulation. This milestone suggests that prehistoric apex predators were far more complex in their daily physiological functions than previously assumed.
Further reading
Learn more about the latest developments in this field by visiting the Geology section.
Source note: This article includes information reported by GlobalPost.
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