Do you raise them for eggs? Meat? Garden slug detail? Fun?
A former house used to have a pond and we had all sorts of wild mallards and the neighbor's rapacious Muscovy. One time one Mama Mallard took her new brood out on the pond....14 little chipmunk like mallards and 1 weird white one. I about died laughing.
Unfortunately, we also had humongous bullfrogs that ate them with gator-like stealth. Each lap around the pond another duckling would disappear. So one year I raided the duck nest and incubated them, kept them in the brooder for about two weeks (heckuva time keeping them out of the water dish...messy, messy things). Didn't matter...the bullfrogs just opened up a little wider. Whodathunk the main predator would be a frog?