Hi I have 2 eight week old chickens, a Barred Rock and a Black Sex Link, and I just bought a bantam Old English chicken who is 3.5 months, all 3 are female. The 2 younger ones have been together since they hatched, and get along great with each other, but when I introduced the 3rd chicken, my bantam, they began to bully her and peck at her. She mostly ran and cowered the first day, the second day she got a little braver, especially at treat time, but the other 2 still pick on her a lot, especially the BSL, so she is usually alone, trying to be invisible, and looking apprehensive. So far no blood, or missing feathers, so should I just stop worrying and let them sort out who's in charge? It is really hard to just watch her get ganged up on...in fact at one point the BSL chased her around their pen pecking and peeping at her so aggressively that I snatched her up in one hand, mid run, (BSL) & pulled her up close to my face so I could glare at her, which startled the heck out the poor girl, which of course made me feel like the worst chicken care taker on the planet, so I spent the next 30 minutes doting on her so she'd forgive me, even though she was being a bad chicken. Anyway, my boyfriend says I am too obsessive and over protective of the chickens, his joke is "How have these poor birds managed to survive this long without you? It's a wonder the species made it at all!"