This means that dinosaurs were warm-blooded. That's a fantastic. It's way cool. Horner said that because of the discovery, he and other researchers will now start doing CT scans on any intact dinosaur fossils they find. Among the effects of the heart discovery, said Horner, is a boost for the idea that birds evolved from dinosaurs, a theory that is becoming more widely accepted by paleontologists.
Birds also have four-chambered hearts.
Such hearts have two chambers that collect and pump blood to the lungs, and two chambers that collect oxygen-enriched blood from the lungs and pump it throughout the body. Most reptile hearts have three chambers, two that collect blood from the body and from the lungs, and one that pumps the blood throughout the body. This means the reptilian blood is less oxygen-rich. Less oxygen in the blood slows metabolism and causes the cold-blooded animals to be sluggish when chilled and to have less physical endurance. The Associated Press.