We just lost one chicken, probably late in the evening (when I went to lock them in the coop, around 9 pm in Indiana, one chicken was missing. In the day they are in our 50 ft square run secured only by chicken wire. I couldn’t see any hole dug underneath, so I assume fox climbed over it. I have an electric fence at about 8” above the ground but that apparently didn’t prevent, I assume fox, getting the chicken. So I would like to get some details of your electric fence.
There is a possibility that a hawk got it, they are about 4 weeks old and are heavy breed (Orpington, RIR, Barred Rock and Australor). Only about 10% or so of the run is visible from the sky, the rest is under the mature trees. Adjacent to the run is fairly large wooded area of around 25 acres. So I suspect the fox was the culprit.