Fossilised teeth reveal first mammals were far from warm blooded – The Conversation UK

Warm blood is one of the key traits that led to the success of mammals as they evolved from scurrying beneath the feet of dinosaurs to spreading into the wild and wonderful collection of animals we know today. But our new research, which involved X-ray scanning hundreds of fossilised teeth, suggests the first mammals were more like cold blooded reptiles, and that warm blood evolved much later.
Warm blood helps us maintain our body temperature regardless of our environment, allowing us to gather…

Click here to view the original article.