I'm thinking of adding 4 muscovys to my flock. I currently have 10 hens. The ducks would have their own house but share a run with the chickens. I've read a few threads about chickens and Muscovy ducks sharing space and it being a disaster but usually the runs seem small. My run is rather large 30' x 30' (900 sq ft). Would that be sufficient space to keep everyone living harmoniously or should I not risk it and keep them separate?