I have a few questions on call duck pens

[The duckqueen]

So I am going to get call ducks to breed I was going to have 5 trios different colors of calls and I thought about the pen situation at first I was going to get a 20x10 pen used for rabbits and have the 15 ducks in there but a friend of mine asked how I'm going to keep the calls breeding to only there two females
So I was wondering what yall thought I should do thanks !

 

[Debbie292d]

If you ran 3 strips of chicken wire every 4 feet, each trio would get a 4' x 10' pen. That's 13 square feet approx per duck.

Don't they need a "hutch" of sorts though to sleep in and lay eggs in? You'd need to make 5 of those too, then that cuts down on their pen size so might not be too healthy for them.