News Paleontology

Telltale Dino Heart Hints at Warm Blood

By Tina Hesman Saey

- More than 2 years ago

He could tell just by looking that this dame had a heart of stone.

A 3-D reconstruction of X-ray scans of a fossil dinosaur shows the heart with its left (L) and right (R) ventricles. Science

When PI (paleontological investigator) Michael (Mike) Hammer stumbled across the big-eyed dinosaur that he calls Willo on a South Dakota ranch in 1993, he noticed her chest cavity right away.