https://earth.yale.edu/news/were-dinosaurs-warm-blooded-their-eggshells-say-yes https://earth.yale.edu/news/were-dinosaurs-warm-blooded-thei... Birds lay eggs

https://earth.yale.edu/news/were-dinosaurs-warm-blooded-their-eggshells-say-yes https://earth.yale.edu/news/were-dinosaurs-warm-blooded-thei... Birds lay eggs and are definitely warm blooded. Not to mention the odd mammal that lays eggs like the platypus.