An analysis of eggshells from three kinds of dinosaurs shows they were all warm-blooded, suggesting that dinosaurs’ ancestors were also warm-blooded
Source:
https://www.newscientist.com/article/2233396-75-million-year-old-eggshells-suggest-most-dinosaurs-were-warm-blooded/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home