Raccoons. Until I figured out a solution, I lost at least 8 - 10 chickens to raccoons reaching in any where they could to get at a sleeping chicken. They pull and pull them and eventually rip off what they can get through the hole and the head is always gone along with some upper body that is in shreds. I don't have chicken wire size I have the 1/2" fencing on everything. Raccoons can reach into what they call "chicken wire".Yesterday evening I found a dead hen inside my secure run. She was wedged under the ramp to the pop door. Two piles of feathers; one near the carcass. The head was missing and the neck stripped to the breast. I thought maybe a racoon or mink did the deed by pulling her head through the WWM, but the other pile of feathers confused me. This morning saw a red tail hawk in a tree near the coop, so now think after the initial attack the hen hid under the ramp where the hawk finished the job. I hope my rooster then drove the hawk away. He has never had to deal with a predator close-up and hope he gained some experience. Never had this problem before but I guess I'll need to somehow cover the run now and perhaps pick off the hawk with my .22 if he's persistent.