i was wondering if someone could help me on what`s killing my chickens..its been 2 days that when i enter the coop i have dead chickens 2 yesterday and 6 today the all have bloody necks some are missing just the head the rest stays there what that could be...i was wondering if rats would do this...it cant be anything big because there is no way they can go in.there might be some tiny holes i would say approx 1 inch..also it seems like only the black ones get killed.the white hens are still all there...hopefully someone can give me some idea on what it could be and also what i could do to prevent this? thanks in advance