Birds change their feathers often; they drop off and they get new ones; this is called moulting.
Having thus given the children as much information on the subject as they will be likely to be able to digest properly, you may then get it back from them by question and answer; as for instance Q.What have we been talking about?
A.Birds' feathers.

Q.Do they do the birds any good?
A.Yes, keep them warm.

Q.What more good?
A.Make them able to fly.

Q.Who gives the birds feathers to make them warm?
A.God.

Q.Are feathers very heavy?
A.No, very light.