I have 46 regular size hens, 2 bantam hens and 1 bantam rooster. We did not intend to have a rooster, but of the 4 bantams I bought, 2 of them were roosters. We gave away the first one when we discovered he was a boy chicken. The other one didn't become apparent that he was a rooster until a few weeks later. I decided to keep him and see how it would work out. He was so small and cute. We have a small nursery in the large coop that we use to introduce new chicks to the flock. The small chickens can go in and out of the nursery but the big ones can't get into the nursery. It has worked great to get everybody intermingled and safe at their own pace. The three bantams hang out in the nursery a lot but in the last few months they have been out more than in and have been eating with the big chickens. They even go outside during the day and free range, which they did not do for a long time. Sometimes the big chickens will dig under the nursery and get in to eat the small chickens food supply. I open it up and let them out. They have never hurt the smaller chickens. Today when I got home and let them out there were 6 or so big chickens in the nursery, which has happened before, and the rooster is dead in there. It would not be impossible for a predator to get in there but I would think a predator would attack one of the chickens roaming around in the larger coop. The chickens were anxious to get out of the nursery and all hopped out quickly, but that is normal as they don't like being trapped in there, especially when the door is open to go out a free range in the yard. All indications were that everybody was getting along fine. I haven't seen any injuries to the rooster or observed the girls picking on him. I don't understand why they would kill him. I guess I am hoping to get some insight to help me understand what has happened. I am one of those chicken people that names/loves/pets/pampers her chickens and I really liked little "Billy Bad *** Rooster." He was so small I gave him a tough name to make him feel big.