Just as a general disclaimer I am a firm believer in evolution. Reptiles are some of the most successful animals on earth. They've thrived for millions of years in a variety of environments where it's warm. My question is why haven't reptiles evolved to become warm blooded? You would think after the temps started to drop after the extinction of the dinosaurs you would think they would evolve to be warm blooded in order to deal with cooler temps. Also, why do reptiles have multi bone jaws while mammals only have one bone that makes up their lower jaw?