Some of you may remember that we recently added a new chick in with our 2 week olds, so now we have 3 almost-3-week-olds and 1 almost-1-week-old in the brooder. Well, the baby BR is beating all the older chicks up! She will follow them around and jump and peck at their eyes repeatedly. They peck her back on the top of her head but she isn't deterred. She really is a bully. What could be causing this and is it normal pecking order stuff or something I can/should curtail? They have quite a bit of space and adequate feed/water as well as a cooler part of the brooder.