Hi there, Azygous, you said from their first mingling with the adults at age three weeks and I just wanted to ask you what, exactly, you mean. Mine are in a tractor right beside the big girls, so they see, hear, etc them all day, but I don't consider this 'mingling'. I'd love to have them in actual contact with the big girls, but I'm afraid that at 15 days old they'd go right thru the outer fence and into the yard. Did you create an enclosure that the older ones can get in and out of but that the babies can't? They flap around pretty good already, I don't know that they couldn't get out and then not back in! They're so fast, I don't know that I could herd them all once they start running free.(I can see it now, I have to run around to the gate and they pop thru the openings at will playing keep-away)