I have this wooden house that I used for chicks to introduce them to the flock. It measures 4 feet wide, 3 feet deep and 2 feet high. It has an access door, pop door and three windows covered with hardware cloth. It's built well. First, is it big enough for 3 ducks? I'm thinking of getting runners. Second, what are the pros and cons of letting them share a run with chickens? Third, will they be OK like the chickens in the winter? Fourth, I know they can eat the same layer pellets as the chickens, but I read that they should not eat seeds. I give my chickens sunflower seeds. Please advise. Fifth, How often will I have to change their water. I understand they make a mess of their water. I thought I'd get one of those black rubber tubs. Maybe it will stay warm longer in the winter and freeze less often and last longer than one of those cheap baby pools. Mmmmm, I think that's it for now, but I"m sure I'll have more questions.