Fossil tooth analysis confirms Tyrannosaurus rex was warm-blooded

By Taylor Nicioli, CNN (CNN) — Scientists have suspected for nearly 60 years that Tyrannosaurus rex was warm-blooded. When a fossilized footprint of T. rex turned up in Alaska in 2022, it added to the evidence that these predators could thrive in frigid environments, where most cold-blooded reptiles could not. Now, researchers have put a