The little girls are getting bigger

The chicks are about five weeks old now and out of their brooder box in the garage.  We made up a little shelter and run for them and they seem very happy there.  Its so interesting to watch them as they haven't ever seen a grown chicken, yet they knew immediately to dig a dust bath, eat grass and all other adult chicken duties.  It makes you wonder what happens to all of that instinct when you live in a shed or a cage your whole life.