Alexander Areshin, candidate of biological sciences, paleontologist, curator of the paleontological collection of the Darwin Museum, spoke about this in an interview with RT. He noted that dinosaurs had a slower metabolism than mammals, so dinosaurs could reach colossal sizes.
According to the scientist, among them there were warm-blooded animals, cold-blooded ones, and species with intermediate physiology - mesotherms. He cited various theories of the extinction of dinosaurs and talked about how their appearance changed throughout the history of study.