Thanks for the responses-Centrachild and JimArcher. The foxes are very brave, and came right up to the barn, which is right by the house. They may have been teaching their young. I lost three, and one of my roosters lost some of his feathers. They didn't take one hen, and I believe the rooster stopped it, but the hen was dead.
I have a large fenced area the others are in now, but that was supposed to be my rooster free area, with just a few chickens. I think it's necessary to free range for better health, but now the dead ones aren't healthy at all.
I'll research, and decide on a breed for free ranging that is predator savvy and can fly well. They won't be totally free range. I have a nice set up in the barn.
I believe a new hobby could be fox hunting this winter.