I've got 3RIR, 2PR (raised since chicks together, 1yr now) and recently bought 2BO (5mo now, faces turing red and voice is changing on one?)........HOW DO I INTRODUCE THEM? I have been slowly acquainting them in separate runs close to one another and have observed aggressive behavior from my 1yr olds toward the younglings....maybe younglings possibly be males? How does this process work and what is the best way to go about it? Thanks!