/ Endotherms Content for UC Davis en /blog/reanalysis-shows-dinosaurs-not-so-warm-blooded <p><span><span><span><span><span><span><span><span>Modern birds and mammals are 鈥渨arm-blooded鈥� or endothermic, maintaining a constant body temperature and generating heat internally, while reptiles rely on heat from their surroundings. It has been known for some time that at least some dinosaurs, including the direct ancestors of modern birds, were also endotherms. </span></span></span></span></span></span></span></span></p> September 07, 2023 - 12:09pm Andy Fell /blog/reanalysis-shows-dinosaurs-not-so-warm-blooded