Choose the waterfowl food used by zoo professionals to care for your flock. Mazuri® Waterfowl Maintenance Diet is for ducks geese swans and other waterfowl. This food is designed to give your birds all the vitamins and minerals they need to stay healthy. With no extra supplements required. Made for adult birds that are fully grown birds that have all their feathers and that are not laying eggs. This floating food is easy for waterfowl to eat while also reducing water contamination. Mazuri® Waterfowl Maintenance food doesn t contain any added colors flavors or preservatives.