***On the farm I had a coon find a way into the coop, killed about 7, ate one right down to the skeleton.***
Several years ago I noticed a large amount of feathers and blood in my hen yard when I went out to open the pen up.
I could find no way anything could have gotten in the house to kill a chicken, and the hens were not spooked at all.
Next morning I noticed fresh guts in the yard and a close inspection found no way a coon could get into the hut, and the hens were still not spooked.
Then I looked closely inside the house and saw lots of blood in one area.
There was a 1 1/2 inch gap between the roof and the wall for air circulation. A close inspection of the outside of the hen hut in that area showed lots of scratches in the wood. I then figured it out.
The coon had learned to jump up the side of the hut, reach through the 1 1/2 space, grab what he could and pull the chicken through the opening. The other hens inside did not even notice one of their own was gone.
I have since closed up those air openings.