My chicks are now approximately 4 weeks old. They are in one side of my coop, the 6 hens sleep in the other side. (The hens' side also has the pop door going out to the run) As I was doing chores this evening, I thought, "Let's see what happens if a couple of hens go in to visit the chicks." So, I opened the door between the two pens (I had the gate to the run closed in case some of the chicks got adventurous, and two of the hens were locked in the coop/run). One of my two barred rock hens and my generic reddish brown hen moseyed on into the chick pen. They were more interested in the feeder and waterer (although they have their own feed and water) than they were in the chicks. A couple of chicks came over to see what was going on, and the BR gave each of them a stern peck, but didn't go after them. They peeped and ran away and she went about her business exploring their pen. She did find an old apple that I had tossed in there for the chicks, but they hadn't figured out what to do with it so she and the brown hen had a treat. Again, a couple of chicks came over to share and she gave them each a peck and off they went. Maybe tomorrow I'll put another couple of hens in with them for a few minutes to see how they do. (I haven't gotten around to building panic doors yet... Maybe if I just keep exposing them a few at a time there won't be too much trouble. I have 30 chicks vs. 6 three year old hens)