We had 10 hens in a coop.(a coop that holds 25 hens). We got 15 more chicks this past May. We had a second smaller coop that the baby chicks went into and they both share a run. Now that it's getting cold I need for some of the chicks who are now much bigger and laying to go to the larger coop so they are not crammed in the smaller that really only holds 10 hen comfortably. When we try and move them to the larger coop they want no part of it! When they free range during the day, they don't really co-mingle they stay in the old lady group, or the young kids group......what the heck can I do???