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

Isotope ratios provide a hint that the giants were actively managing temperatures.

The short version

• For most of the last century, T. rex was pictured as a sluggish, tail-dragging reptile that had to warm up in the sun before it could go anywhere.
• Then, further research changed that view, replacing it with the active, bird-like animal shown in the movie Jurassic Park .
• But whether T. rex used warm blood to power that activity remained a question.

What happened

Now we might have gotten closer to an answer. A team of researchers led by Randon J.

Why it matters

Eagle, geochemists at the University of California, Los Angeles, has measured the T. rex body temperature by analyzing its teeth.

Summary by Nerd News Network. Read the full article at Ars Technica via the links above and below.