Answer to Question #235003 in Evolution for Pere

Question

Why is it that in evolutionary tree birds never give rise to mammals but birds are the closest to mammals?

Answer 1

Birds' bodies are coated in feathers. No animals have feathers, yet the majority of them have hairy skin. Finally, birds lay eggs, hard-shelled eggs to be precise. Mammals give birth to their young, whereas birds' offspring must hatch from eggs.