Foxes have been my number one predator problem over the years. Only a handful of hawk attacks, but I've lost count of the number of fox attacks. Foxes have a nasty habit of sort of going kill crazy. What I mean is, if one gets in your run or coop, for instance, he may go nuts and kill way more than he needs and only make off with one bird. This happened to my nine ducks. A fox got into their pen, killed all of them and took only one with him for his meal. Another thing, they come back. They almost always seem to come back. If you get a frequent "visitor" fox, he'd clean you out if you gave him the chance. We've always set traps and stood guard outside when the number of attacks were up. I always did "flock inspections" about every hour or so, since I'm home most of the time. Something that has also worked well for me is putting a radio outside by the coop and letting it play throughout the day when the flock is out ranging. That was my latest trick, and I haven't had a problem...yet. I've also kept everyone locked up on random days, so he can't get an idea when they'll be outside. Believe me, they're crafty little buggers. We just have to be craftier. I hope this helped some. Best of luck!