I have 2 white bantam cochins, 14 weeks, and 2 partridge bantam cochins, 9 weeks. They have been hanging out all day and started sleeping in the same coop about 4 weeks ago. Everything seemed to be going well until this week. One of the white cochins (Millie) started pecking at the partridge ones when they go into the coop at night. The older ones always go in first, then the younger ones. Millie is driving them back out of the coop. When I saw it, I took her out for a few nights, put her in a hutch until dark and then put her back in the main coop. So, is this bullying or normal pecking order? Should I let her sleep in another coop? Will she learn to stop this behavior?