T. rex teeth indicate it ran as warm as an elephant

Chemical analysis of a 66-million-year-old T. rex tooth reveals the predator maintained a body temperature of approximately 97 degrees Fahrenheit. This finding provides direct evidence that T. rex was warm-blooded, similar to humans and elephants. Isotope ratios suggest these giants actively managed their internal temperatures, which explains how the species remained active and survived in cold environments as far north as Alaska. This discovery clarifies the metabolic nature of the prehistoric giant predator.