I here so much about chicken coops but not for ducks. I bought a chicken coop and need to know if I should elevate the housing,..chickens like that but do ducks need to be elevated? Momma duck is kinda thick and about 9yrs old. Also this thing seems flimsy,..what is Important to reinforce,.does animals dig under to get in? If I make an additional run should it have a roof? I have an acre of land so they can have free range,..I want them safe at night,..we have foxes, coyotes and several raccoons live nearby and opossums,.. what mistakes can I avoid?