So we got the 2 grown roosters AND all but 1 of the older-chick roosters out of the coop permanently, and we thought that'd be the end of losing chicks. That left 2 age groups in the pen, with the rooster (a RIR) from the older age group. One group is about 8 weeks old and the other group is 10 weeks old. HowEVER, we've lost 1 of the younger chicks yesterday, and 2 are injured today. Those 2 are in an "isolation ward", separately. Every time I go into the coop, all seems well. No squawking, everyone evenly dispersed in the coop, and the mood appears calm. How do I find out who's the bully/bullies? This HAS to stop. We cannot keep losing chicks like this. BTW, the one that died had no visible injuries. The 2 that are injured have blood on the top of their head, and in addition the other one has blood on the back of the neck. Thanks in advance.