We recently had the same thing happen to 2 of our girls on 2 separate occassions 4 days apart. Very sad, we found them in the morning. They were ravaged. Something had pulled part of the chicken wire off the coop and got in. We boarded everything up real well and the remaining go inside a box in the coop that we also have boarded up for night. Last night my husband was outside covering some plants to protect them from the frost, and what do you think he saw on top of the coop? 2 huge raccoons. He chased them away and we let our dogs out there to bark at them. This was around 8:00pm. we went out there a few times before going to bed to check on things, and we didn't see them again, but we did see where they had gotten the wire off again and made themselves a small whole to get into. Luckily the chickens were in the boarded up box so nothing could get to them. We have had these girls for 8 years and have never had this happen. I know raccoons have been around for quite some time though. So mad. I love all creatures and don't want to see them get hurt, but when I saw them on the coop last night staring us down, I wanted my husband to shoot them. We live in the city so he can't quite do that. Anyway, box them up good at night , from dusk to after dawn.