What's killing my hens?
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Here's a link from the BYC Learning Center
It lists known predators of backyard birds. What types of predators in your area? Sounds like it's possibly a Raccoon or Possom, but could also be a Weasel or Fisher Cat if you have those in your area.
Where I live I have to provide a predator proof secure coop and environment to protect mine from Coyotes, Fox, Raccoons, Possum, Skunk, Hawks, Owls, Eagles, Dogs, and Stray Cats.
That's it, My four girls are going in the spare bedroom, Sorry not making lite of the situation, Two of my babies are near deaths door and we have every predator in Northern Ny so i'm really in a panic already for when it's time to go into their coop.Sorry this is happening to you, Good luck
One of my friends has luck with banana peals and peanut butter. Other sources say marshmallows. But I have had lots of luck with cat food.