Ok, I just introduced my four 13 week olds to my 2 hens and things seem to be going along pretty well. yesterday the 4 babies spent a few hours in the yard with the biggies and I only saw/heard one or two pecks from my alpha hen. so far today, nothing. the little ones are mostly scared of the 2 adults and my hens dont seem to care at all anyway. besides, the little ones are too fast for the big girls to catch anyway. It was really cute because DH actually seemed to want to hang out in there to keep an eye on the babies. (usually he pretends that they are my chickens and he has no interest) but we chicken- sat all day and looks like today will go as smoothly as yesterday I may even see if they will get a long so well that they can all roost together tonight. wish me luck... the babies LOVE LOVE LOVE being in the large chicken yard!!