My guess would be on the drowned ducklings that they were on the momma's back and then jumped into ice cream bucket. I would try a 5 gallon bucket for the momma, its a long reach but if its full she'll be able to reach it. As far as wing clipping, I have found if I don't clip wings they roost on top of my house and make a terrible mess! I also have had trouble with coyotes when they didn't stay in the pen. You'd think that as well as they can see at night and the fact that when I go out at night and see them they are always awake, plus I have motion sensor lights on my house that come one that a coyote wouldn't be able to or attempt to get my muscovies but I lost several to coyotes last spring. Strange thing is they didn't even take the carcases, they just left them laying around in the yard. I went out and cleaned the birds the next morning, based on how little they were damaged I think they died of shock. As far as ducklings go I never get more than 6 or 8 to a hatch and all my hatches have been from the same duck. As a matter a fact, I have two ducks sitting now, the beginning of January. I really hope nothing hatches because its too cold for ducklings right now in my opinion. Apparently my crazy ducks don't think so. I wonder if me leaving a light on 24/7 in the chicken house might have something to do with that though. That's the only way I can get any eggs in the winter. I know I probably shouldn't leave it on that much but its kind of nice if I've been at work 10 hours and when I get home its dark and the chickens haven't been fed. I can feed them and know they get the feed instead of the rats!