What do y'all think... We will be adding the little duck to the other two when she's bigger, but I'm thinking about getting one more duck that's a little more year-round with the eggs than the Rouens. Is this house big enough for four of them? It's 2'x3' on the inside (plus the little "courtyard"). They have access to the entire 10'x10' pen 24/7, but there will be three hens laying eggs if we do add another. Opinions/thoughts... ??