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Mallard ducks are omnivores, so they have a lot of plants and animals to choose from when it is time to eat. Some of the vegetarian entrees for Mallards are water elm seeds, oak seeds and hackberry seeds.Mallard ducks also eat wild rice, corn, wheat and barley. Other plants in a Mallard's diet include bulrushes, primrose and willow. Insects such as beetles, flies and dragonflies are tasty treats for Mallard ducks.Mallards also eat mollusks, small fish and fish eggs.On the water's surface, Mallard ducks also feast on frogs, tadpoles, worms and snails. These types of foods provide the protein and fat nutrients a Mallard duck needs in its diet.ther plants in a Mallard's diet include bulrushes, primrose and willow. Insects such as beetles, flies and dragonflies are tasty treats for Mallard ducks. Mallards also eat mollusks, small fish and fish eggs.
Many ducks also eat gravel, small stones or sand. While these items do not provide any nutritional value for ducks, gravel, stones, and sand actually help ducks digest their food better. The rough texture helps break down the duck's food.ome of the plants that ducks eat are grass, weeds, algae, seeds, grain, berries, fruit and aquatic plants. Some of the animals that ducks eat are snails, mollusks, worms, frogs, salamanders, small fish and fish eggs. Ducks also eat insects. One species of duck called the Merganser, eats mostly fish.