We have 12 chickens - 1/2 barred rocks, the rest are new Hampshire and rhode island reds. We have an English bantam rooster but he's harmless. My husband and I have found 2 chickens (barred rock) dead in two days in a row. THey were in the same nesting box (not one they use for eggs) and have been torn apart by the other chickens. This is a new pack of chickens but went 4 or 5 days without any incident when we put them together in a big horse stall (which we have converted to a coop). THey have plenty of food and water. What could be going on here? I should say there is no evidence of critters and we have it pretty tightly sealed up. Any and all advice is welcome!