I have 10 chickens and 3 ducks, and they share a 1250 square foot run when I am not home. If I am home through the day I let them free range. I was out and checked on them this morning then came in for a shower. After my shower, maybe 25 minutes later, I went out and they all came out of the woods, but one duck was missing. The rest of the flock all seemed calm, so I looked around and didn't find her. Normally the ducks seem to share one brain, and if one is three steps behind the others it is panicking to catch up, so a wandering duck does not seem normal. I am worried a fox may have gotten her... but would it seem weird that a fox would only get one of the 13 birds, and that the rest would seem to calm? I don't see any trace of the duck, but the woods where they hand out is dense and I could have missed it. I called for her, and she usually quacks loudly all the time.... nothing. Now I am second guessing my letting them free range while I am home! But they seem so much happier when they are out! They have a large run but they have devoured every speck of grass in it... is it wrong to feel like the risk of predators is worth the happier life with days outside the fence? I'm conflicted! Also, my ducks are Indian Runners. I am new to raising both chickens and ducks, so I don't have much experience. However I was under the impression that runners are unlikely to be hiding somewhere sitting on a nest. My ducks haven't even laid any eggs yet that I know of, they are 18 weeks old.