I'm sorry this happened to you. This is such a huge fear of mine. I've been trying to get a big run built for my birds but time is my biggest enemy these days.
I didn't specify that foxes killed for fun, only that many predators do. The implications were that any flock is endangered of being killed all at once.
Many predators kill for fun and can kill an entire flock in one go. I wouldn't free-range. Sounds like it is time to build an enclosure. I currently free range and I hate it. I had to move quickly last fall and have not had a chance to build a new enclosure. It took a village just to move our...