How do people breed there ducks. I already have some but they are rouens. I just free range them during the day and at night pen the up. I ant to start raising and breeding other type of ducks but don't know how to seperate them from eachother. I do go way alot some room enough in the pen is good but i have limited space. I was thinking of doing a 3' wide by 2' long shelter and then a 3' by 3' outside run(but still inside the cage). Then with some flexible fenceing doing a little area in the grass outside the pen for them to be during the day. That way they are seperated by breed and still have room.