This morning I went out to feed and water my chickens and I noticed one was missing. I have 6 22 week old hens in a pen and 5 others in another pen. One of the 6 hens was gone. There is no sign of entry, no blood or feathers and no digging or tracks. The run is attached to the coop and totally enclosed in chickens wire, top is covered in bird netting and there is another layer of rabbit fencing around the bottom....dug in and bent at the bottom to prevent digging. We don't have any kids so we don't think anyone let her out, but we can't figure out where our hen is. Anyone got any ideas?