I was wondering the same thing. I have 2 rescued chicks that are fully feathered, and are just too big to be with the littles now, so I actually have them in a separate brooder right now, and the chicken run will fully be done today so they can go out during the day, still too cold at night for my comfort. So excited, just waiting for my hubby to come home with 5 feet of chicken wire, we were short. But I'm worried that my 2 older girls well be brats to the 9 littles once they are ready to come outside. They were all together in the same brooder for 2 full weeks, and I only separated them this week because the 2 big girls were just to big, no fights or anything, they just needed more room, so do you think they will remember each other? I sure hope so, because I'm not quite sure how I will go about separating them, unless we have the fence done for their 75 ft by 20 ft free range, but I figured that once we got the run and coop done, we would be good for at least a month to build the rest. We built the coop under our 14 foot high deck, and then fully framed with chicken wire 8 ft by 12 ft enclosure to lock them fully up at night. We live up in the mountains and get very large birds, so I want them fully locked at night.
Any thoughts on the 2 older girls remembering the littles.