In the realm of paleontology, the debate over whether dinosaurs were warm-blooded has been ongoing. Recently, a team of researchers has innovatively used chemical analysis to determine the body temperature of two Tyrannosaurus rex specimens.
Aradhna Tripati, a professor and geochemist at the University of California, Los Angeles, highlighted the challenges faced in this study. She co-authored the latest research published in the journal Science Advances and shared insights with CBC’s Quirks & Quarks program before an interview with host Bob McDonald.
The traditional method of measuring body temperature in living creatures was not feasible for dinosaurs, which became extinct around 66 million years ago. Instead, the scientists employed a chemical technique that involves examining specific hard tissues like tooth enamel and eggshells for temperature-related variations.
This technique focuses on the mineral bioapatite found in these tissues, where specific isotopic compositions reflect different temperatures. By comparing these isotopic patterns in living animals with varying body temperatures, the researchers could estimate the body temperature of extinct animals, including dinosaurs.
A previous study by UCLA scientists a decade ago utilized this approach on eggshells from titanosaurs and oviraptors, concluding that they were warm-blooded. Additionally, teeth from plant-eating dinosaurs like brachiosaurs were analyzed for further insights.
To determine the body temperature of a Tyrannosaurus rex named Thomas, the researchers had to overcome the challenge posed by the thin tooth enamel of tyrannosaurs. They refined their technique using teeth from the megalodon shark before obtaining samples from Thomas and another unidentified T. rex specimen.
The analysis of these specimens indicated that T. rex’s body temperature ranged between 33.8°C and 38.8°C, akin to large mammals such as elephants and flightless birds like ostriches. This revelation sheds light on the potential adaptability of Tyrannosaurus rex to different environments.
The implications of these findings extend to the behavior and habitat range of T. rex, suggesting that a warm-blooded metabolism would have allowed them to thrive in diverse climates. The study has garnered praise from paleontologists like Anthony Fiorillo and François Therrien, underscoring the significance of understanding dinosaur physiology for reconstructing their ecological roles in ancient ecosystems.