Scenario I have 3 adult hens and 1 adult duck - they are a bonded flock - 1 waddes and the others run with a wobble.... they waddle and wobble around together. I got 2 biddy hens on April 18th - probably just a few days old - so now they are like 9-10 weeks old. They still peep. Both 'flocks' have been kept separate. I'm looking at the local farm store who has chicks still - some look as old as my biddies and some look much younger. I'm more interested in the younger birds - still have their baby down on them. I haven't inquired about the breed or ages yet. Wanted to know if I can add young birds in with my two 10 week olds or will their be mayhem in the tractor over night??? I really don't want to add a 3rd separate flock in yet another living situation. As it is, I am letting the older birds free roam a while in the evenings with the youngsters. I plan for them ALL to be together in the new coop being built. I am taking that process slow. Thanks in advance for any light you can shed on whether I can safely add a few more biddies to my now adolescent twosome flock or have I waited too long.