http://providence.craigslist.org/grd/2751771538.html I think I am too new to post pics but hopefully this link will work. A. Will this work for ducks? I'm assuiming they won't need the nesting box (or will they?) and the chap says he can custom make one for me without it. B. How many ducks could live happily in either size? I was thinking of 4-6 for a nice flock. C. How long should the run be? Cheers.