Chicken wire keeps chickens in. It does not keep predators out as it's easy for them to chew right through chicken wire. Please consider 1/2" hardware cloth for at least the bottom few feet of your pen.I'm about to build mine out of 2x4 Frames. 20' x 16' and 5 foot high all enclosed with the basic 1" chicken wire. For 4 ducks. Hope it would work