Not sure what is getting them, but this is the second one that is missing. Of course it is my little hen who is blind in one eye. She was my favorite. The first one was a rooster so I wasn't really upset as I ended up with more roosters than hens. I have five acres and have walked every inch of it. I don't see any piles of feathers or her body. Makes me think it is a hawk or maybe an owl at dusk. Though I was thinking my boys and girls are getting to big to be picked off by a hawk. They are BO and are now 20 weeks old.