I don't know what happened, but my guess is that I have a mean rooster. With my last batch of bird purchases I have gotten more roos than hens - I just want the hens, I plan to put the roos in a separate pen, but my husband bought ducks and they are currently in the pen that we had setup for the Roos. So I have corralled all of the Roos into a section of my coop under the hen house that I have labeled Chick Nursery just to keep them separate from the rest. The 2 hens that I found dead were bought all at the same time as the roosters so I am not sure why they killed them. They are about 4.5 months old. I have 6 older Hens that are about 14 months old. Now all of my hens want to stay in the house rather than roam the yard. So I am hoping that separating them calms down the hens. What causes a Rooster to kill?