Reconstruction of a dinosaur from the Catalan pre-Pyrenees, about 70 milion years ago. | Oscar Sanisidro. Institut Català de Paleontologia Miquel Crusafont

Dinosaurs May Have Been Warm-Blooded

How warm an animal is has an impact on their metabolism -- and how quickly they can grow and have babies.

June 28, 2012
3:00 AM EDT