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BackTyrannosaurus rex's body temperature is estimated to be around 36.3 degrees, a US research team announced
Tyrannosaurus rex's body temperature is estimated to be around 36.3 degrees, a US research team announced
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時事通信39 minutes agoScience1 min readJapanView original

Tyrannosaurus rex's body temperature is estimated to be around 36.3 degrees, a US research team announced

tyrannosaurus rexbody temperaturefossil

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  • A research team from the University of California, Los Angeles and other institutions announced that they analyzed carbon-13 and oxygen-18 isotopes in the tooth enamel of a Tyrannosaurus rex excavated in Montana and estimated that the animal's body temperature was approximately 36.3 degrees Celsius.
  • This is the first concrete estimate of body temperature that supports the idea that dinosaurs were at least partially homeothermic rather than poikilothermic.

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Why It Matters

Dinosaurs were traditionally thought to be cold-blooded, like reptiles, but recent research suggests that at least some dinosaurs may have been homeothermic, like mammals.

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The body temperature of Tyrannosaurus rex, a large carnivorous dinosaur, is estimated to be around 36.3 degrees Celsius, similar to that of humans, a research team from the University of California, Los Angeles and other institutions announced in the American scientific journal Science Advances on the 16th. The idea that dinosaurs were at least partially homeothermic like mammals, rather than cold-blooded like reptiles, has been growing in recent years, and this is the first time that their body temperatures have been specifically estimated.

[Photo Feature] Tyrannosaurus Rex, the largest and strongest carnivorous dinosaur

The fossils analyzed were young adult fossils from the late Cretaceous period that were excavated in the state of Montana in the northwestern United States and are housed at the Los Angeles County Museum of Natural History. Carbon-13 and oxygen-18 isotopes, which exist in small amounts in nature, were extracted from tooth enamel and measured, and the ratio was estimated based on the fact that the ratio reflects the rise and fall of body temperature.

It is thought that their body metabolism was active due to their high body temperature, which is thought to be one of the reasons why they were able to move vigorously to catch prey and were able to adapt to the cold north and highlands.

Open Questions

  • What was the body temperature of dinosaur species other than Tyrannosaurus rex?
  • Can this method of estimating body temperature be applied to other fossils?
  • What influence did homeothermy have on the evolution and ecology of dinosaurs?

Related Topics

tyrannosaurus rex
OrganizationsUniversity of California Los AngelesLos Angeles County Museum of Natural History
PlacesmontanaLos Angeles
Topicsbody temperaturefossilisotope analysisUniversity of California Los AngelesScience Advancesmontana
This article was originally published by 時事通信.

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