I have three chickens. Got a pair of Blue Laced Red Wyandottes, about 8-9 mos. old, who have been together since birth. Also a Leghorn mixed hen probably 18 mos. old. We got them all and they've been living together for almost two weeks. The Wyandotte hen, Penny, chases and shoos away the mixed hen, Bernadette, at feedings. I noticed this morning several of the mixed hens feathers seem to have been pulled out - small feathers looks like from the top of her back. I have never seen such an assault take place by either of the Wyandottes against the Leghorn, but clearly something is going on. I don't want her to be hurt. What should I do? They stay in a coop, but usually free range in the yard for 2-4 hours every day. The Leghorn hen doesn't seem to be hurt, but I have seen the Wyandotte hen chase and peck at her. Ideas? Suggestions?