Hi guys! I haven't posted in a while! So, I have some hens (and a mean roo) that were hatched on 3-11-12, and some hens and a roo that were hatched on 6-10-12. I want to introduce them but I don't know how. This morning, I put the older hen in the pen with the younger chicks, and they would stand on tiptoe and puff out their neck feather and peck each other. I don't want that to keep happening. By the way, I think I have to get rid of my older, mean roo. Please help!