All birds grow feathers. They have different kinds of feathers to do different jobs. All birds have wings. Wings help birds fly and keep their balance. Birds have beaks.
Birds have different kinds of beaks, depending on the kind of food it eats.
Birds have different life cycles from the other animals we have studied. Most animals come from eggs that are produced by the female animals. Many birds lay several eggs per year. An egg contains everything needed to form a new animal. Bird eggs have a shell or hard outer covering.