I have an acre lot.....we have a back yard with grass, then we have a fence to seperate the "pasture" from the yard and to keep the dogs away from the ducks. So, my ducks just have free roam of the pasture. If I need to separate....HOW? We have a pond for all of them.....do I just put up a fence and tell the boys, "Too bad, the pond is for the girls for now?" Is that what you guys do....just put up a temporary fence, or do you have a permanant spot that you put the ones you are separating??