Sorry for your loss. I know it's only their natural behaviour and they can't change it but it's that element of them that puts so many folk offside. When we first had poulty/waterfowl we'd occasionally lose one if we were late putting them to bed at night and we accepted that that was our fault then around 2 years ago we started to lose birds during the middle of the day so we built runs for them all out of fox-proof mesh. The winter before last a fox managed to chew its way into a run containing 6 nearly full grown Muscovy ducklings that we had hatched months earlier - bit the heads off 6 and took the 6th. A couple of months later it managed to dig its way into the run containing their parents and killed all 3 there as well. Unfortunately the land where we keep our birds (and bees) is out of sight of our house; even if I did have a gun I've only ever seen a fox on our field, or the one next to it about 3 times.