So I have 21 three week olds in a brooder coop in a sectioned off part of my run. I have a mama hen with 6 one week olds. The one week old have been out with mama for 5 days and the three week olds ventured outside two days ago. Both are small enough to run back and forth between sections and get along fine. I was watching and the current flock is ignoring the 3 wk olds when they venture through. Do they assume they are mama's babies? Can I just drop the divider now or should I still do the few weeks of separation for integration?