I have a small flock of 5 orphaned chicks. They were with their mother until 2 weeks ago, when she was killed by, sadly, my own dog. They are growing well, doing fine, until today. They were out of their brooder, hanging out in the adult chicken pen (the adults - 4 of them - were free ranging in the yard), when my daughter noticed that one had a bloody head! I picked her up and she had been pecked on the head and neck. On closer look, I found the culprit - who also had peck marks on his head and was bleeding. They seem okay except for the head wounds, still eating and drinking. But when I put them back together in the brooder, one immediately attacked the other. So I put one into another cage for the night. Will this make the chick even more vulnerable tomorrow? They are about 5 weeks old, I think. It's hard to see any sex changes so far, but maybe the fighters are two little roos? Thanks in advance.