Last Jan. we got 6 pullets and they started to lay in April. One died in October, and we got 3 new pullets about 3 months old. We were told we could put them in the pen after a day or so, if they all could see each other. We put the new pullets in the second or third night... big mistake. The older ones would not let the younger ones near the food nor water. We built a second coop attached to the first and kept them separated by chicken wire. It is now about 6 or 7 weeks they have been separated. I built a sliding door between the coops so that they could see each other. They all now seem to be looking quite a bit at each other through the wire. NOW for the question.... Will it be safe to open the door and let them co-mingle without too much trouble with the pecking order thing. Or should we just leave things the way they are with them separated? They all are now about the same size, but the younger ones have not totally developed their combs. Any advise will be much appreciated!!