Fossil tooth analysis confirms T. rex was warm-blooded with near-human body temperature

Across 68 million years of silence, a fossilized tooth has spoken — and what it reveals is a startling kinship between the most fearsome predator of the Cretaceous and the warm-blooded creatures who walk the earth today. Researchers analyzing isotope ratios preserved in T. rex tooth enamel have determined that the animal maintained a body temperature of roughly 97 degrees Fahrenheit, placing it squarely among endothermic animals like elephants and humans. The finding closes a long chapter of paleontological debate and opens another: if the apex predator of its age burned fuel like a mammal, th