I have a nice size pen of Bob White quail,they are all the same age and have been together for quite some time .but they all pick on 2 of the hen and I have to keep putting them off in a small coop by they're selves,all of the outer pick the back of they're skull open,the males and females are doing this to only these 2 girls .i have moved them out and back in atleast half a dozen times.giving the 2 little hens pleanty of time to heal,but when I put them back they do it again in a matter of a couple of hours they will open the heads right down to the bone .... PLEASE someone tell me why are they doing this I NEED HELP