We also have ducks in the city too! They eat just about the same stuff as the chickens. Pellets or crumbles layer feed, corn, oyster shells and mealworms. They have a coop too, made of the same wood that the chicken coop is made from. The only difference is the ducks need a place the swim. Like a kiddie pool or a pond. They are more messy than chickens.
My white Pekings Beetlejuice and Lydia and Chris's Blue swedish Tux