I am a new chicken mama and our 9 chicks are just over 4 weeks old. We have all different breeds- my white leghorn is picking on my brahma. I noticed earlier to day that she was pecking at her from under the roosting pole and then this evening I realized that my brahma has blood around her vent area and her back is missing feathers and bleeding. They are still in a brooder set up with 3 roosting poles and we are setting up our coop tomorrow. Is this normal behavior at such a young age? I took my leghorn out and have in her in a temporary set up by herself that is on the small side and she is trying to fly out but seems to be settling down with her food and water now. Do I need to remove my brahma too? It does not appear than anyone else is pecking at her. Should I put them all into the coop together when we get it set up tomorrow? Help!!