Dinosaurs were hotblooded creatures claim scientists who measured their body temperatures for the first time

The findings, based on studies of fossilised dinosaur teeth, lend support to the idea that dinosaurs were warm-blooded creatures which regulated their body warmth.

Source:
http://www.dailymail.co.uk/sciencetech/article-2007613/Dinosaurs-hot-blooded-creatures-claim-scientists-measured-body-temperatures-time.html