I have had several flocks of birds in my life, but I always started with the same birds, and kept them until their time had come, and then started over. I have never introduced chicks to an established flock. I have read the articles here about waiting until they are at a minimum of 16 weeks old, which I understand. Just want to know where to go from there. I am fortunate to have a very large yard with vegetable gardens, and plenty of trees, shrubs, firewood, stumps, and all kinds of stuff for climbing, foraging, playing, etc. My flock free ranges from sun up to sun down, and go in their coop at night. I have Rhode Island Red and Barred Rocks, currently. My Roo is a Barred Rock. He's a big baby, total Momma's boy, but takes care of his girls very well. I would also like to know your opinions on introducing another Roo into the flock, I was thinking of getting a Rhode Island Red Rooster as a chick, and then raising him with everyone, but I dont want to upset Consuelo, or the dynamic of my flock. I dont HAVE to do it, but I wanted to hear what all of you thought. As far as the breeds of chicks I was going to purchase, I was looking to get : more Barred Rocks Buff Orpingtons Silver Laced Wyandottes I would love to get some Black Stars but there aren't any available currently. Okay, I will ramble forever about my chickens. Thank you for any and all advice you can offer! Looking forward to many more conversations!