How sad, I am so sorry. Hard to say, and it's a shame, but please remember this: The wild animals
are not deliberately vindictively killing your pets. They are hungry and see food. Which, technically,
is what nature designed chickens to be. It's been a rough winter here. Best thing you can do is wait a bit before you get some more and then make your enclosure as predator proof as possible. There are lots of things you can do to make that happen. Free ranging during the day, and a place where they can roost high at night, are two things that have helped our flock very much.