We have four SS chicks that are 5 weeks old. I was wondering how to tell the pecking order, or when they'll form it if they didn't. Is there some way to tell by their size, personality, etc? One of them was pecking the others on the head when they were a day old bringing them home, but she's currently one of the smallest. (There's one other small one.) She acts weird too. When we let them run around a room, she's always off doing her own thing, while the other three are pretty much together. Does that mean anything?