I am planing on getting 13 ducks (3 pekin, 3 rouen, 3 cayugas and 4 khakies). I want to divide the breeds into runs that are 5 x 6 with a 4 x 3 house outside of the run. Can I use hardwood plywood for flooring or will that be to slick and hurt their feet? How many square feet does each duck need in the run, would 5 x 6 work for 3-4 ducks? Could they fly over a 6 foot fence? Can these breeds interbreed? How much water do they need? Can ducks live with chickens and other birds?