I found bodies or bunches of feathers to account for all but one duck. Today, almost a week later, I pulled into the driveway and thought I heard quacking! SO I went down behind the coop and sure enough, there was the duck, down in the creek! I couldn't catch her by myself cuz of the underbrush but I'll set up some sort of pen and chase her into it tomorrow. She seems to be unharmed (she moved fast enough, for sure!) SO once I get her back, I guess I'll just have to go get another couple of ducks to keep her company, right?