Scientists at UCLA have successfully measured the body temperature of Tyrannosaurus rex by analyzing fossilized teeth, revealing that the prehistoric predator maintained a body temperature of approximately 97 degrees Fahrenheit—remarkably similar to that of humans. The research, published in Science Advances, represents the first actual temperature measurement for the extinct species and provides physical evidence supporting long-standing theories about T. rex physiology.
The breakthrough relied on improvements to a temperature estimation technique initially developed about a decade earlier. The original method required substantial amounts of fossil material that institutions were reluctant to remove from irreplaceable specimens. UCLA researchers refined the technique to reduce material requirements by roughly 90 percent, making it practical to use. This advancement convinced the Natural History Museum of Los Angeles County to provide small portions of two teeth from Thomas, one of the most complete T. rex skeletons in the museum’s collection.
The measurement method exploits microscopic chemical bonds within tooth enamel. Rare isotopes of carbon and oxygen bond together in patterns that vary based on temperature, with fewer bonds forming in warmer conditions. Researchers used a dental drill to collect enamel samples, then dissolved the material in phosphoric acid and analyzed the resulting gas with a mass spectrometer. Tooth enamel proved ideal for this analysis because its crystalline structure resists chemical alteration over geological timescales, unlike bone material that constantly undergoes remodeling.
The findings indicate T. rex functioned as an active, metabolically efficient predator or scavenger rather than a sluggish animal dependent on solar heating. The warm-blooded physiology may have provided a crucial survival advantage in challenging environments. T. rex fossils have been discovered in ancient Alaska, where conditions would have been inhospitable to cold-blooded reptiles despite the Cretaceous period being generally warmer than today. The body temperature measurement supports the evolutionary connection between tyrannosaurs and modern birds, whose body temperatures typically range from 104 to 109 degrees Fahrenheit.
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