Most predatory animals hunt at dusk or dawn. Could be almost anything that is predatory since they are free range. If you live near or in the woods the pickings are that much easier. Fox, badger, weasel, fisher, stray dog, owl, hawk, feral cats, coyote, bobcat, mountain lion, a really hungry bear, eagle wild boar. I've even seen coons that will hunt in broad daylight if they are hungry enough and have kits.All depends where you live and the lay of the land. Once they find a good source for food they will not leave until they can't access it any longer or their dead. So either you have to coup your girls up until the sun is out and before the sun disappears. circle them in electrical wire fencing, or be available for a little early dusk and dawn hunting of your own. Hunting camera helps to see what you don't. Can't blame the predator, that's what they do but it is maddening as all get out when you invest in the birds only to provide a free buffet.