I have some white rock hens, about 1 year now, I started with 15 and when they where still young a bantium sebright got into their cage and after taking her chicks away she pecked at 2 of the behinds until they died. then in early fall we moved the remaining 10 into a nother pen with a laying box. Now they are doing the same thing and they have killed 4 of their fellow hens. I just found one tonight dieing in her laying box, her vent was all picked at and most of those feathers where gone and bloody. she was still alive we moved her but i doubt she will be in the morning. That the heck is happening with these white rocks.??