I already have 1 Drake with 1 duck. I have 2, 6 week old duckling that I was hoping was ducks. One white layer has her voice so I know she's a duck. The other one still has no voice so I'm thinking its a drake. I really want to keep him but don't want them the run the 2 ducks down. How many more ducks would I need for 2 drakes? I'm not sure yet if he is a Rouen or a golden 300.