Birds are warm-blooded and vertebrate, like mammals, but they have feathers and they develop in eggs outside of their mothers’ bodies. Bird eggs have hard shells. Not all birds have feathers right when they hatch. Some are hatched naked, and grow feathers as they develop. Birds do not have teeth, and instead of having jaws, they have a beak. Most birds can fly. Birds take care of their young. Some examples of birds are parrots, penguins, owls and chickens.
