Hi! So we have 7 adult chickens and 2 adult mallard ducks. We have six 9 week old chicks, 3 8 week old ducklings and 1 6 week old duckling. The young ones are all together and have their own mini coop right now. I have been moving them from their small coop area into our dog run during the day so they have lots of space and the older chickens can see them and kind of get used to them. Our older chickens are free range. My question is at what point could I start letting the younger ones out to free range with the older ones?