Mallard

One of the most widespread waterfowl anywhere, the Mallard (Anas platyrhynchos) is a medium-sized dabbling duck. Its native range spans the Northern Hemisphere across North America, Europe and Asia, and it has been introduced to many other parts of the world, New Zealand among them. A breeding drake carries an iridescent green head, a white neck ring and a chestnut breast, while the hen stays mottled brown for cover on the nest.

Nearly every domestic duck breed apart from the Muscovy descends from the Mallard. Generations of selective breeding from Mallard stock gave rise to the Pekin, Rouen and Khaki Campbell, among others. That same lineage explains why Mallards cross so readily with domestic and other wild ducks, which is part of why they are so numerous.

The Mallard dabbles rather than dives. It tips forward in shallow water to reach plants and small animals near the surface and bottom, and it grazes on land as well. Comfortable on ponds, lakes, rivers, wetlands and town parks, it turns up readily around people.

Who it suits

A keeper with water and outdoor space, such as a pond or a regularly refreshed pool, is well placed for Mallards. The bird is hardy and active and does well in mixed waterfowl groups. Since Mallards fly strongly, anyone wanting them to stay put needs secure fencing or wing management. In New Zealand the Mallard is a game bird, and holding or taking birds can be regulated, so check with Fish and Game New Zealand and the Department of Conservation before you acquire stock.

Being a naturally occurring wild species rather than a made breed, the Mallard has no single origin point in the way a developed breed does. Its range takes in North America, Europe, North Africa and much of Asia, and the species has long shifted with the seasons across these regions.

Ducks were domesticated from Mallard stock independently in more than one place over a long stretch of time. Kept ducks appear in the records of ancient societies, and selective keeping for meat and eggs slowly produced birds that parted from their wild relatives in size, colour and temperament.

That Mallard base gave the domestic breeds we know today. Heavier table breeds such as the Rouen and Pekin, and prolific layers such as the Khaki Campbell, all trace back to Mallard ancestry. The Muscovy duck is the main exception, descending instead from a separate South American species.

Because the species crosses so freely, wild Mallards, domestic escapees and hybrids now mingle across much of the world. This genetic openness has helped the Mallard spread, but it also raises conservation concern where it hybridises with rarer local ducks, an issue of note where the species has been introduced.

Sturdy and medium-built, the Mallard has a broad flat bill and webbed feet suited to both swimming and walking. The difference between the sexes is its most striking feature. A breeding drake carries a glossy green head, a thin white neck ring, a chestnut breast and a pale grey body, finished with a small upward curl of black feathers at the tail. The hen is mottled brown all over, which hides her while she sits.

Both sexes wear a patch of iridescent blue feathers on the wing, the speculum, edged in white. Outside the breeding season drakes moult into a duller brown much like the hen, called eclipse plumage, then return to bright colour before winter.

Coat and colours

Mallard plumage is built for water. An outer layer of overlapping feathers sheds water while the down beneath traps warmth. During preening the duck spreads oil from a gland near the tail across the feathers to keep them waterproof. Bill and leg colour is a handy field cue: the drake shows a clear yellow bill against the hen's mottled orange. The blue speculum stays visible in both sexes year round and helps separate Mallards from lookalike species.

Active and social, Mallards fill their days swimming, foraging and preening. Curiosity draws them fast to new food sources, which is part of why they do well around people. Yet they stay alert, with a strong flight response when startled; a flushed Mallard lifts off fast and steeply.

With people the Mallard runs from wary in wild settings to fairly bold where it is used to being fed, though hand-tameness comes down to the individual and its upbringing. With other ducks and waterfowl it is generally sociable and forms loose flocks, though drakes can turn pushy in the breeding season. Hens make attentive mothers and lead ducklings to water soon after hatching. The birds are vocal, with hens giving the classic loud quack and drakes a quieter raspy call.

Mallards are hardy and their care is fairly simple, but water sits at the centre of it. They use water to feed, clean their feathers and keep their waterproofing in order. A pond, or a pool emptied and refilled regularly, covers what they need.

Grooming

• Mallards groom themselves through frequent preening and need no brushing or trimming.
• Give clean bathing water so they can keep feathers waterproof and free of dirt.
• Check feet and legs now and then for cuts, swelling or bumblefoot.
• Keep bedding and the water area clean to cut skin and eye problems.

Exercise

• Daily access to open water for swimming and dabbling.
• Land space to walk, graze and forage.
• Foraging chances such as scattered greens or safe pond plants keep birds active.
• Mallards fly well, so plan for secure overhead netting or managed wing feathers if birds must stay on site.

Environment

Set up a predator-proof shelter for nights, since ducks are vulnerable to dogs, mustelids and birds of prey. The shelter should be dry, ventilated and bedded with clean straw or shavings. Mallards handle cold well thanks to their down, but they need shade and fresh water in hot weather to avoid heat stress.

In the wild Mallards eat a mixed diet of seeds, aquatic plants, grasses, insects, snails and other small water animals. They dabble at the surface, tip forward to reach food below, and graze on land. In care, a balanced commercial waterfowl or poultry feed should form the base, with greens, vegetables and natural foraging added. Laying hens and growing ducklings need higher protein and adequate calcium, so match the feed to life stage.

Treats and supplements

Safe treats include leafy greens, peas, chopped cucumber and small amounts of mealworms. Put out insoluble grit so birds can grind food, and give laying hens a calcium source such as crushed oyster shell. Keep treats to a small share of the diet so birds keep eating their balanced feed.

Mallards are robust, and with clean water, good feed and predator protection they usually reach around 5 to 10 years in care. Wild birds often live shorter lives to predation and disease. Most health problems in kept Mallards come back to dirty water, an unbalanced diet or injury, so prevention centres on those.

Preventive care

• Keep swimming and drinking water clean to cut botulism and infection risk.
• Feed a balanced, life-stage diet and avoid overfeeding rich food to ducklings.
• Provide dry, soft footing and clean bedding to prevent bumblefoot.
• Check birds regularly for parasites, weight loss and injuries.
• Quarantine new birds before adding them to an existing group.

In the wild Mallards use a wide range of wetlands, from lakes and rivers to marshes, flooded paddocks and town park ponds. They favour shallow water for dabbling, with cover nearby for nesting. In care, housing should copy those basics: open water to swim and feed, land to forage, and a safe place to shelter and sleep. Mallards fly strongly, so any enclosure meant to hold them needs overhead netting, or the birds need managed wing feathers.

Setup checklist

• Clean water source for swimming and drinking.
• Sloped or stepped pool edge so ducks can get in and out easily.
• Predator-proof night shelter with a secure door.
• Sheltered nesting spots with cover for hens.
• Shade for hot weather and a windbreak for cold.
• Fencing and, if needed, netting to manage flight.

Mallard eggs take about 28 days to hatch. A broody hen sits her clutch, keeps it warm and turns the eggs herself, then leads the ducklings to water soon after they hatch. For artificial incubation, eggs are held at a steady temperature with controlled humidity and turned several times a day until the final days, when turning stops and humidity rises for hatching.

Hatching steps

1. Collect clean, undamaged eggs and store them cool and pointed-end down for no more than about a week before setting.
2. Warm eggs to room temperature, then set them in a stable incubator at the target temperature.
3. Turn the eggs several times a day and check temperature and humidity.
4. Candle around day 7 to 10 to confirm development and remove clear or dead eggs.
5. Stop turning around day 25 and raise humidity for the hatch (lockdown).
6. Leave hatched ducklings in the incubator until dry and fluffy, then move them to a warm brooder.