I have 3 7-month old hens that are very health. I was very saddened today when I went down to give the girls their AM snack of greens and one was not in sight. I thought Rhoda was in the nesting box laying her morning egg. When I bent down to look into the coop, she was standing under the overhang of the roost and her entire head had been attacked. All three hens were raised together as chicks starting at 4 days old and neither of the other two had a scratch on them. Their coop is located inside a fenced in Pen which has wire mesh around the perimeter to discourage anything from trying to dig under it and is screened overhead so that there's no way a flying predator could drop down from above. The only way in or out is through the screened door. I didn't see any signs of forced entry and all the door latches were secure. I didn't see any digging around the pen so I thought that one of the other girls must have done it. Or both of them? But they've never had any issue and all three go everywhere together in the pen, so I find it impossible to think that the two of them ganged up on the third and did this to her. Has anyone come across something like this and have an idea on what it might have been? The only thing I can think of that could slip through the chicken wire in the pen's fence would be a rat or snake. It really saddened me to see her like that and I made arrangements this morning to have her euthanized. I'm worried that if it was a predator it could repeat the attack on the other two.