Glad you found out what it was - at least now you know how to plan. Sorry for your losses! I was gone one weekend and my daughter forgot to lock the coop and run up one evening and I lost 6 out of 12 hens to a predator. Only one was "eaten". The rest were simply killed and left. She was very apologetic and I don't think she'll forget to lock the coop again as the sight made quite an impression on her.