T. rex was warm-blooded, isotope analysis of teeth suggests

New research analyzing isotope ratios in Tyrannosaurus rex teeth suggests the iconic dinosaur maintained body temperatures comparable to modern elephants. The findings provide evidence that T. rex was likely warm-blooded, actively regulating its internal temperature rather than relying on external heat sources. Scientists used isotope analysis as a proxy for metabolic activity, a method that can reveal clues about an animal's physiology from fossilized remains. The discovery adds to a growing body of evidence reshaping our understanding of dinosaur biology and metabolism. If confirmed, it places large theropod dinosaurs firmly in the category of active, endothermic animals rather than sluggish cold-blooded reptiles.