Our run is 8X20. On the bottom 1/2, we have it covered with .5" hardware cloth. The top 1/2 is 1" chicken wire. The top is covered by .5" deer netting. The floor is more .5" hardwre cloth covered with about 3 inches of dirt and mulch. The chickens are about 23-24 week old hens. 3 Days ago, we found 2 dead chickens, both were RIR's, one looked fine, the other was half eaten, feathers were everywhere. Today, 1 was half eaten, a BO. There were no holes anywhere in the fencing, so we're not sure what got them. Our kids were hot on our heals, so we didn't get a chance to take a look for bite marks. My plan is to keep them locked in the coop for a couple days to see if there is a psychopathic chicken in the mix. Any other ideas??