I have several hens brooding eggs, one buff orp and two sex-linked (second time around for the buff orp). I have 7 nest boxes, and the other chickens take turns in the occupied nests when the brooding hens leave to feed. One day last week, we found that two of the eggs, with nearly ready-to-hatch chicks, had been pecked open and the chicks were dead. Today, I found another one that had one half the shell removed and the dead chick in the other half tossed out of the nest. I suspect the buff orp, but I haven't caught the culprit red-handed. For now, the suspect is segregated from the rest. After the first incident, I thought it weas because the hens had not gone back to the nest box where they started, so I made sure that at night, the hens were in their proper boxes; however, with today's events, being in the right box doesn't appear to be the solution. I've had hens rear eggs that were not their own before, but this is the first time I have three going at the same time. Has anyone had this problem?