We have last 3 hens in as many days. Hens in hiding positions under logs or in their dust "cave" with heads pulled off laying nearby. No other signs of trama. My coop/run is impenetrable, no signs of damage to bird cloth, no holes larger than a mouse hole. This leaves me to believe something inside the coop/run is killing them. The rooster is from eggs raised this summer by a broody, she was latest killed. One of the new egg pullets was killed too. All the victims were lower on the pecking order. No signs of aggression with other chickens or even the rooster. But he's biggest and the only rooster so he's my #1 suspect. I have him free ranging on his own at the moment and others locked in run.