Dinosaurs: Mammals Or Reptiles

• Crocodiles are lizards are ectothermic(cold-blooded) animals.
• Humans and birds are endothermic(warm-blooded).
• Dinosaurs are somewhere in between these two and are classified as mesothermal.

Dinosaurs needed a warm climate to survive, and any sharp temperature decrease could have been fatal for them. Changes in vegetation and climatic deterioration could also be factors in the eventual decline of the dinosaur, paving the way for primates and humans.