Tooth study shows T. Rex was warmblooded, with human-like temperature

This 2026 photo provided by UCLA shows scientist Robert Eagle holding a Tyrannosaurus rex tooth that was used to measure the dinosaur’s body temperature. — Photo: UCLA via AP

Using chemical clues in Tyrannosaurus rex teeth, scientists have shown that this massive predator was warm-blooded - with a body temperature close to that of a person - in a finding they said should prompt a fundamental change in the perception of the celebrity dinosaur.

The chemical makeup of the enamel in three T. rex teeth unearthed in Montana indicated that the dinosaur had a body temperature of 97.3 degrees Fahrenheit (36.3 degrees Celsius), plus or minus 4.5 F (2.5 C), the researchers found. For humans, the average body temperature is 98.6 F (37 C).

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这张由加州大学洛杉矶分校提供的照片拍摄于2026年，照片中科学家罗伯特·伊格尔手持一颗霸王龙牙齿，这颗牙齿曾被用于测量恐龙的体温。——图片：加州大学洛杉矶分校，经美联社授权使用

科学家利用霸王龙牙齿中的化学线索表明，这种巨大的掠食者是温血动物，其体温接近人类。他们表示，这一发现应该会从根本上改变人们对这种明星恐龙的看法。

研究人员发现，在蒙大拿州出土的三颗霸王龙牙齿的牙釉质化学成分表明，这种恐龙的体温为华氏97.3度（摄氏36.3度），误差范围为华氏4.5度（摄氏2.5度）。而人类的平均体温为华氏98.6度（摄氏37度）。

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