Our run is large, we covered one section of it with bird netting, btw we have no problems with coons or possums, we do see hawks and many eagles and although our run is not completely covered it is covered enough so a bird cannot swoop into the run and the flock can hide. We had one loss to an eagle last summer, a muscovy duck who was free ranging. We were lucky enough to get the bird netting for free. Caution: make sure netting is tight and there are no loose ends or flaps hanging down. I learned the hard way finding a pullet hanging by her neck on some netting that wasn't fastened securely. Problems fixed now. Sorry for your loss. Another idea is adding some shelters inside of the run. We have a calf hutch, a metal tent, and a long metal overhang that was originally made for shade purposes. Good luck.