What Do Ducks Eat? Complete Diet & Feeding Guide

Ducks are omnivorous waterfowl with a digestive system adapted for processing a wide variety of foods. In the wild, their diet shifts with the seasons and includes aquatic vegetation, duckweed, algae, seeds, grains, insects, larvae, snails, worms, small fish, and crustaceans. This natural variety means domestic ducks benefit from a diverse diet built around a nutritionally complete base feed.

Unlike chickens, ducks have flat, broad bills designed for dabbling and filtering food from water and mud rather than pecking at hard surfaces. They do not have a crop in the same way chickens do, and they swallow food whole, which means they need water available at feeding time to help wash food down safely. Their gizzard grinds food internally, so access to grit supports healthy digestion.

Ducks also have a higher requirement for niacin (vitamin B3) than chickens. Niacin deficiency is one of the most common nutritional problems in domestic ducks and can cause bowed legs, enlarged hock joints, and difficulty walking. This is why waterfowl-specific feed is strongly preferred over standard chicken feed for ducks of all ages.

Below is a categorized guide to foods that are generally safe for ducks when offered appropriately. Always introduce new foods gradually and in moderation.

Vegetables: Peas (a duck favorite), corn, chopped leafy greens (romaine, kale, Swiss chard), cucumber, zucchini, broccoli, cauliflower, green beans, sweet potatoes (cooked), squash, carrots (grated or cooked), cabbage, and bell peppers.

Fruits: Watermelon, cantaloupe, berries (strawberries, blueberries, raspberries, blackberries), grapes (halved), bananas, peaches, pears, and apple slices (no seeds). Fruits are higher in sugar, so offer them sparingly.

Grains & Seeds: Oats (rolled or cooked), rice (cooked), wheat, barley, millet, sunflower seeds, flax seeds, chia seeds, and pumpkin seeds. These are good supplemental energy sources.

Protein: Mealworms, earthworms, scrambled eggs, small fish, and crickets. Protein-rich treats are especially beneficial during molting, laying, and cold weather.

Herbs: Basil, cilantro, parsley, mint, and dill. Many herbs have mild health-supporting properties and ducks enjoy foraging through them.

Key rule: Treats and supplemental foods should make up no more than 10-15% of the total diet, with the remaining 85-90% coming from a complete waterfowl feed.

Some foods are toxic or harmful to ducks and should never be offered:

Toxic foods: Chocolate, avocado (persin is toxic to birds), onions, garlic, dried or raw beans (contain hemagglutinin), rhubarb leaves, and nightshade family leaves and stems (tomato and potato plant leaves).

Poor nutrition foods: Bread is the most commonly fed but least appropriate food for ducks. It fills them up without providing adequate protein, vitamins, or minerals, and excess bread in waterways promotes algae growth and attracts pests. Crackers, chips, cookies, cake, candy, and other processed human snacks fall in the same category.

Potentially harmful: Citrus fruits (can interfere with calcium absorption and cause digestive upset in some ducks), spinach in large amounts (oxalic acid can bind calcium), salty foods, and anything moldy or spoiled.

Choking hazards: Whole grapes (always halve them), large chunks of hard vegetables, whole nuts, and popcorn kernels. Ducks swallow food whole, so cutting food to appropriate sizes is important for safety.

When in doubt about whether a specific food is safe, check with your veterinarian before offering it.

Ducks have different nutritional needs at each life stage. Matching the right feed to the right age is one of the most important feeding decisions.

Ducklings (0-3 weeks): Start with a waterfowl starter feed containing 20-22% protein. If waterfowl-specific starter is unavailable, an unmedicated chick starter supplemented with brewers yeast (for niacin) can work. Ducklings should have free-choice access to feed and fresh water at all times. Provide grit from about 3 days old if ducklings are eating anything besides commercial feed.

Juveniles (3-20 weeks): Transition to a grower feed with 15-18% protein. Growth rate slows during this phase but ducks are still developing. Continue to provide fresh water and grit. Treats can be introduced gradually but should remain a small percentage of the diet.

Adult maintenance (20+ weeks, non-laying): A maintenance or all-flock feed with 14-17% protein supports healthy weight and feather condition. Adults typically eat about 4-6 ounces of feed per day, though this varies with breed, activity level, weather, and forage access.

Laying ducks: Switch to a waterfowl layer feed with added calcium (typically 2.5-3.5% calcium) to support eggshell formation. Providing crushed oyster shell free-choice allows laying hens to self-regulate their calcium intake. Protein should be around 16-18%.

Molting ducks: Feather regrowth demands extra protein. During the annual molt, consider offering a higher-protein feed or supplementing with protein-rich treats like mealworms.

The foundation of a healthy duck diet is a complete commercial waterfowl feed. Several types are available:

Waterfowl starter: Formulated specifically for ducklings and goslings with appropriate protein (20-22%) and niacin levels. This is the gold standard for young ducks. Brands like Mazuri, Purina, and Scratch and Peck offer waterfowl-specific starters.

Waterfowl grower/maintenance: Lower-protein formulas (14-17%) designed for growing and adult non-laying ducks. These provide balanced vitamins and minerals without excess calories.

Waterfowl layer: Higher calcium content to support egg production. Use only for actively laying ducks, as excess calcium can harm the kidneys of non-laying birds.

All-flock feed: A versatile option if you keep mixed poultry species. Typically around 16-18% protein. Supplement with niacin (brewers yeast) if using an all-flock feed not specifically formulated for waterfowl.

Pellets vs. crumbles: Ducks generally do better with pellets than mash or crumbles, as they waste less feed. Many duck keepers offer feed in water or in a container near water to reduce waste and support natural feeding behavior.

Typical cost: A standard 40-50 pound bag of conventional duck feed costs approximately $20-$35, while specialty or organic options run $50-$65.

Most ducks on a complete waterfowl feed do not need extensive supplementation, but a few additions can be beneficial:

Niacin (Vitamin B3): The most important supplement for ducks, especially ducklings. If using chicken feed instead of waterfowl feed, add brewers yeast at a rate of about 1.5 tablespoons per cup of feed, or follow your veterinarians recommendation. Niacin deficiency causes leg problems, poor growth, and joint swelling.

Calcium: Laying ducks need extra calcium for eggshell production. Offer crushed oyster shell free-choice (not mixed into the feed) so ducks can self-regulate intake. Non-laying ducks and drakes should not receive extra calcium.

Grit: Ducks need insoluble grit (small stones) to grind food in their gizzard, especially if they eat anything besides commercial pellets. Free-range ducks often pick up natural grit, but confined ducks should have grit available.

Vitamins and electrolytes: During heat stress, illness recovery, or heavy laying periods, a poultry vitamin and electrolyte supplement in the water can provide a short-term boost. This should not replace a balanced diet.

Probiotics: Some duck keepers add poultry-safe probiotics to water or feed to support gut health, particularly after antibiotic treatment or during stressful transitions.

Duck nutritional needs shift with the seasons:

Winter: Ducks burn more calories to stay warm in cold weather. Increase feed portions by 10-20% during freezing temperatures. A late-evening feeding of cracked corn or whole grains provides slow-burning energy that helps ducks generate body heat overnight. Ensure water does not freeze, as ducks must have water to eat safely. Warm (not hot) water can encourage drinking.

Spring: Laying season begins and foraging increases. Switch laying ducks to a layer feed if not already on one. As natural forage becomes available, ducks may eat slightly less commercial feed.

Summer: Heat stress can reduce appetite. Offer feed during cooler morning and evening hours. Provide frozen treats like peas in ice or cold watermelon to encourage eating and hydration. Ensure water is cool, clean, and always available. Electrolyte supplements can help during extreme heat.

Fall: Ducks typically molt in fall and need extra protein for feather regrowth. Increase protein-rich treats like mealworms. As temperatures drop, gradually transition back to winter feeding routines. This is also a good time to evaluate body condition before winter.