I don't know for certain yet, but it looks like two of my three khaki campbells are drakes, with only one duck. They're 5 weeks old. Their house, which they're locked in at night, is a 4' by 4' A-frame, so I don't think it's big enough for more ducks, but I don't want to part with these guys, and I couldn't separate them, as they are all very bonded to each other. I've been wanting call ducks, would getting a female call duck or two do the trick? Would the house be big enough? (They free range during the day) I'd really want to get a day-old though, or incubate, so it'll be friendly. I really don't know what to do. Any advise?