Mallard Ducks aka Hawaiian Mallard

Mallard Ducks aka Hawaiian Mallard or Koloa (Anas platyrhynchos)

Mallard Ducks aka Hawaiian Mallard or Koloa (Anas platyrhynchos; Greek for “flat-billed duck” – .formerly known as Anas boscha).

In North America, it is also known as Wild Duck. It is a widespread dabbling duck found in wetland areas, including parks, small ponds and rivers.

The Mallard is the ancestor of all domestic duck breeds, except the Muscovy Duck.

Mallard Ducks is on Flight
Mallard Ducks is on Flight

The Mallards are probably the best-known of all ducks and are believed to be the most common duck species on Earth; and they are not considered threatened. However, one major threat to this duck species includes hybridization with other ducks it is closely related to. Mallards frequently interbreed with the American Black Duck, Northern Pintail and domesticated species, leading to various hybrids; and these hybrids are actually fertile (able to produce young).

They are exceptionally fast flyers for their size, reaching speeds of 65 km/h (40 mph).

Alternate (Global) Names:

English: Greenhead, Common Mallard, Green headed Mallard, /Northern Mallard, Greenland Mallard (conboschas); Florida Mallard, Florida Duck (fulvigula); Mottled Mallard, Mottled Duck; Mexican Mallard, Mexican Duck; Hawaiian Mallard, Hawaiian Duck, Koloa (wyvilliana); Laysan Mallard, Laysan Duck/Teal (laysanensis) …

Spanish: Ánade de Hawaï, Ánade Hawaiano … French: Canard de Hawaii, Canard des Hawaï, Canard d’Hawaii, Canard koloa German: Hawaii-Ente, Hawaii-Stockente, Koloaente, Laysanente, Stockente, Zwergstockente … Czech: kachna havajská … Danish: Hawaiiand … Estonian: havai sinikael-part … Finnish: Havaijinsorsa … Norwegian: Hawaiiand … Dutch: Hawaiian eend, Hawaiieend, Hawaii-eend … Swedish: Hawaiiand … Hawaiian: Koloa maoli … Italian: Germano delle Hawaii … Japanese: hawaimagamo … Polish: krzyzówka hawajska, krzy?ówka hawajska … Russian: ????? … Slovak: kacica havajská

Mallard Duck Distribution / Range:

They breed throughout the temperate and sub-tropical areas of North America, Europe and Asia; but also frequent Central America and the Caribbean.

The Mallard is strongly migratory in the northern parts of its breeding range. They breed from Alaska and Quebec south to southern California, Virginia, Texas, and northern Mexico; and migrate south to winter throughout the United States and south to Central America and the West Indies.

They have also been introduced into Australia and New Zealand. It is now the most common duck in New Zealand.

It is highly gregarious outside of the breeding season and will form large flocks. Both male and female mallards are unable to fly after molting until they re-grow their flight feathers in time for the fall migration.

Their preferred habitats include lowland habitat, such as marshes, ponds, small lakes, sheltered coastal bays and estuaries, shallow pools, tidal flats, and protected coves – but they also inhabit mountain lakes and streams. Mallards also graze in stubble fields. They mostly nest in nest in grasslands away from the water’s edge but have been known to use old bird nests, tree cavities, rights-of-way, and meadows with woody vegetation

The Mallard is one of the species to which the Agreement on the Conservation of African-Eurasian Migratory Waterbirds applies

Mallard Duck Description:

The mallards are one of the largest ducks. This dabbling duck measures 20 to 26 in (50 to 65 cm) in length (including beak and tail). It has a 32 – 39 inches (81–98 cm) wingspan and weighs :2 to 3 lbs (1 to 1.4 kg).

The size of the Mallard varies clinally, and birds from Greenland, although larger than birds further south, have smaller bills and are stockier. It is sometimes separated as subspecies Greenland Mallard (A. p. conboschas).

The breeding male is unmistakable, with a green head, black rear end and a blue speculum (= distinctive wing patch) edged with white, obvious in flight or at rest. Males also possess a yellow bill with a black tip, whereas females have a dark brown bill.

When the male molts, he loses his distinctive green head feathers, but he still has the white collar ring and rusty-brown chest. This is commonly referred to as the “eclipse plumage.”

The female Mallard is light brown, with plumage much like most female dabbling ducks. It can be distinguished from other ducks, by the distinctive speculum (= a well-defined patch of colored, often iridescent feathers on the wings). In non-breeding (eclipse) plumage, the drake looks more like the female.

Mallard Duck Similar Species

  • Female dabbling ducks look very similar to the mallards. However, the mallard is the only one duck with blue speculum (wing patches) that are bordered on both sides by white.
  • The American Black Duck Adult male looks similar to the adult female or eclipse male Mallard. However, the body is darker overall and there are no white borders on blue speculum (wing patch).
  • The Red-breasted Merganser male looks similar to the adult male Mallard. It also has a green head, white neck ring and reddish chest. However, it has a shaggy crest and a long thin bill.
  • The Northern Shoveler male also has green head (like the mallard male), but the chest is white and the sides rusty-colored.

Mutations and Hybrids (Photos and Information)

Mallard Ducks on the Water
Mallard Ducks on the Water

Mallard Duck Lifespan

The Mallard’s average life span in the wild:5 to 10 years. The oldest recorded Mallard lived for 29 years in captivity.

Subspecies of the mallard and their ranges

  • Greenhead, Common Mallard, Green headed Mallard, /Northern Mallard (Anas platyrhynchos platyrhynchos – Linnaeus, 1758) – Nominate Race
    • Found throughout most of Palearctic ecozone (Europe, Asia north of the Himalaya foothills, northern Africa, and the northern and central parts of the Arabian Peninsula). and Nearctic ecozone (covers most of North America, including Greenland and the highlands of Mexico)
  • Greenland Mallard (Anas platyrhynchos ssp. conboschas – C. L. Brehm, 1831)
    • Range: Southwestern Greenland
  • Mexican Duck (Anas platyrhynchos ssp. diazi – Ridgway, 1886)
    • Range: Extreme southern USA, from Arizona to Texas, south to central Mexico
    Hawaiian Mallard, Hawaiian Duck, Koloa (Anas platyrhynchos ssp. wyvilliana – P. L. Sclater, 1878)
    • Range: Kauai and Oahu Is (Hawaii).
  • Laysan Duck/Teal (Anas platyrhynchos ssp. laysanensis – Rothschild, 1892)
    • Range: Laysan Island – a Northwestern Hawaiian Islands
  • Mariana Mallard (Anas platyrhynchos ssp. oustaleti) – probably extinct
  • Florida Mallard, Mottled Mallard/Duck (Anas fulvigula or Anas platyrhynchos fulvigula – Ridgway, 1874) – Some authorites classify this as a subspecies of the Mallard, but most list it as a separate species.
    • Resident in central and south Florida and occasionally strays north to Georgia.
  • Mottled Duck (Anas fulvigula maculosa syn Anas platyrhynchos maculosa – Sennett, 1889) – Mostly considered a subspecies of the Mottled Duck.
    • Range: From the gulf coast of Alabama through Texas to northern Mexico (Tamaulipas) (Stutzenbaker, 1988). Outside the breeding season individual birds may venture as far south as to Veracruz (southeastern Mexico).

Mallard Duck Calls / Vocalization

This is a noisy species.

The male has a nasal call, which is quieter than the female’s very familiar loud “quack” that is typically associated with ducks.

Mallard Duck Breeding Behavior

Groups of male mallards (drakes) chase and display to females all winter long, but even more so in February and March (shortly before the breeding season). Once a male has attracted a female, he remains at her side to prevent her from mating with other males.

The mated pairs then migrate together and breed in the northern parts of their range. They are very territorial during that time.

Mallards also have rates of male-male sexual activity that are unusually high for birds. In some cases, as many as 19% of pairs in a Mallard population are male-male homosexual.

When mallards pair off with mating partners, often one or several drakes will end up “left out”. This group will sometimes target an isolated female duck — chasing, pestering and pecking at her until she weakens (a phenomenon referred to by researchers as rape flight), at which point each male will take turns copulating with the female. Male Mallards will also occasionally chase other males in the same way. In one documented case, a male Mallard copulated with another male he was chasing after it had been killed when it flew into a glass window.

Mallard Duck Nesting


Mallards usually nest on a river bank, but not always particularly near water. Those living in urban areas may build their nests in very unusual places, including parking lots or rooftops, near swimming pools, in window wells, and even in flowerpots. They use locally available plant material or the hen’s breast feathers.

Hens lay six to 14 creamy to greenish-buff colored eggs. Incubation is done by the hen and lasts 23 to 29 days. Once incubation has commenced, males abandon the nest and join a flock of other males.


The hen leads her young to the water within 24 hours of hatching. The young are fully independent 50 to 60 days after hatching. However, mallards are very family-oriented and stay with their young.

The ducklings are precocial, and can swim and feed themselves on insects as soon as they hatch, although they stay near the female for protection. Also, young ducklings are not naturally waterproof and rely on the mother to provide waterproofing.

Mallard DuckCalls & Song

This is a noisy species. The male has a nasal call, whereas the female has the very familiar “quack” always associated with ducks.

Mallard Ducks Flying
Mallard Ducks Flying

Mallard Duck Diet & Feeding

Mallard Ducks are omnivores. They usually feed by dabbling for plant food or grazing. They are often seen with their head under water and their tails sticking up in the air as they are looking for their next meal underwater, which may be plant food, invertebrates (i.e., insects), fish or amphibians.


They can filter tiny animals from the water by means of the lamellae (miniature ridges inside the bills of water-feeding birds or “teeth”) that line the inside of the bill.

They will also graze on land, feeding on grains and small plants. Their bills have a sharp “nail” on the tip which they use to pick up small prey.

A large part of their diet consists of various aquatic plants and invertebrates, as well as crops. They feed on duckweeds (Lemna spp, Spirodela spp.), smartweeds (Polygonum spp.), grasses (Poaceae), sedges (Carex spp.), pondweeds (Potamogeton spp.), rice-cutgrass (Leersia oryzoides), arrowhead (Sagittaria latifolia), wild millet (Echinochloa spp.), crustaceans, worms, snails, spiders, corn, acorns and soybeans.

Instead of “teeth,” ducks have serrations (saw-like edges) on their bills that allow them to filter food out of the water.

Recently, these “dabbling ducks” have been observed DIVING under water for food – information and a video.


Feeding Mallard Ducks

We all enjoy ducks and many of us offer them food to encourage them to come over and stay around – and it works! Who doesn’t like an easy meal!

However, the foods that we traditionally feed them at local ponds are utterly unsuitable for them and are likely to cause health problems down the road. Also, there may be local laws against feeding this species of bird – so it’s best to check on that rather than facing consequences at a later stage.

  • Foods that can be fed to Ducks, Geese and Swans to survive cold winters and remain healthy.

Please note that feeding ducks and geese makes them dependent on humans for food, which can result in starvation and possibly death when those feedings stop. If you decide to feed them, please limit the quantity to make sure that they maintain their natural ability to forage for food themselves – providing, of course, that natural food sources are available.

Relevant Resources

Gordon Ramel

Gordon is an ecologist with two degrees from Exeter University. He's also a teacher, a poet and the owner of 1,152 books. Oh - and he wrote this website.

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