加州大学洛杉矶分校的研究团队通过分析化石牙齿中的同位素化学键，首次直接测定了霸王龙的体温约为97华氏度（36摄氏度），与人类和大象的体温基本相同2。这项研究采用了来自洛杉矶自然历史博物馆收藏的"托马斯霸王龙"的两颗牙齿作为样本，发表于2026年9月16日的《科学进展》期刊2。
研究结果提供了直接证据表明霸王龙是恒温动物，具有相对较快的新陈代谢2。相比之下，现代冷血爬行动物的体温维持在28-30摄氏度，而鸟类体温则高达40-43摄氏度2。霸王龙的高体温解释了它为何能在包括阿拉斯加在内的寒冷地区生存2。此外，研究团队在十年间将该检测所需的化石材料减少了约90%，大幅提高了技术效率2。
Researchers at UCLA have determined that Tyrannosaurus rex maintained a body temperature of approximately 97 degrees Fahrenheit (36 degrees Celsius), placing it on par with modern elephants and humans.12 Scientists achieved this breakthrough by analyzing isotopic chemical bonds preserved within fossilized teeth, providing the first direct measurement of the extinct predator's internal temperature.2
The study examined two teeth from a specimen nicknamed "Thomas the T. rex," housed at the Natural History Museum of Los Angeles.2 The findings indicate that T. rex was a warm-blooded animal with metabolic rates comparable to modern mammals, a characteristic that likely enabled it to survive in harsh environments including regions as far north as Alaska.2 The research, published on September 16, 2026, in Science Advances, represents a significant methodological advance—over the past decade, researchers reduced the amount of fossil material required for temperature detection by approximately 90 percent.2
The newly documented body temperature positions T. rex distinctly above modern cold-blooded reptiles, which typically maintain temperatures between 82 and 86 degrees Fahrenheit (28 to 30 degrees Celsius), and ancient crocodilians at around 86 degrees Fahrenheit (30 degrees Celsius).2 The predator's thermal profile also differs from that of modern birds, which operate at significantly higher temperatures ranging from 104 to 109 degrees Fahrenheit (40 to 43 degrees Celsius).2 The research team included Robert Eagle, a UCLA biogeochemist, lead author Randy Flores, and Alessandro Chiarenza, a paleontologist from University College London.2
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