Mallard
The mallard, Anas platyrhynchos, is perhaps the most familiar bird on earth, yet its story is far stranger than a casual glance at a city pond would suggest. That iconic green-headed drake feeding bread in the park is also a genetic force powerful enough to erase entire species. A bird rated by the IUCN as least concern is simultaneously listed as an invasive species in multiple countries. And the quack that children imitate does not belong to the male at all. By the time this documentary is done, the mallard will look very different to you: not a harmless backdrop to Sunday walks, but one of the most consequential birds alive, with a history stretching back to Carl Linnaeus, a complicated love life that earned a researcher an Ig Nobel Prize, and a population estimated at more than 17 million mature individuals and still changing the wild world around it.
Carl Linnaeus first formally described the mallard in 1758 in the 10th edition of Systema Naturae, assigning it two binomial names: Anas platyrhynchos and Anas boschas. The second name was generally preferred for well over a century, until 1906, when Einar Lönnberg established that A. platyrhynchos held priority because it appeared on an earlier page in the text. The scientific name translates roughly as "broad-billed duck," drawing on the Latin Anas for duck and the Ancient Greek platyrhynchus, combining platys, meaning broad, and rhunkhos, meaning bill.
The common name has its own tangled roots. Originally, mallard referred to any wild drake, not the species specifically. The word derives from the Old French malart or mallart, though the true derivation is unclear. Scholars have noted possible links to the Old High German masculine proper name Madelhart, a connection supported by alternative English forms recorded as "maudelard" and "mawdelard". The Latin masle, meaning male, has also been proposed as a contributing influence.
The genome of Anas platyrhynchos was sequenced in 2013, opening a new window into the bird's evolutionary past. Mitochondrial DNA analysis of the D-loop sequence suggests mallards may have evolved in the general area of Siberia. Their bones appear rather abruptly in European fossil deposits and ancient human food remains, with no good local predecessor species to account for them. A large Ice Age subspecies, named Anas platyrhynchos palaeoboschas, made up at least the European and West Asian populations during the Pleistocene.
At 50-65 cm long, with roughly two-thirds of that length being body rather than neck and tail, the mallard is a medium-sized duck that runs slightly heavier than most other dabbling ducks, weighing 0.7-1.6 kg. The wingspan spans 81-98 cm, and the bill measures 4.4 to 6.1 cm.
The breeding male is unmistakable: a glossy bottle-green head separated from the purple-tinged brown breast by a white collar, a pale grey belly, a black rear, and a bill that is yellowish-orange tipped with black. The female is mottled brown, each feather showing sharp contrast from buff to very dark brown, a pattern that functions as camouflage when she is sitting on a nest. Both sexes carry iridescent purple-blue speculum feathers edged with white on their wings, visible in flight and at rest but shed temporarily during the annual summer moult.
Duckling plumage at hatching is yellow on the underside and face, with streaks near the eyes, and black across the back with yellow spots. Around one month of age the young bird starts to look more like an adult female. By 50-60 days after hatching, the fledgling period has ended and the duckling can fly. Sex becomes visually apparent through three markers: bill colour, breast feather shade, and whether the central tail feather curls. Full adulthood arrives at fourteen months, the average life expectancy is three years, though mallards have been known to live to twenty.
The Greenland subspecies, A. p. conboschas, described by C. L. Brehm in 1831, is a living demonstration of two biological rules at once. It is slightly larger than mallards further south, consistent with Bergmann's Rule, which holds that polar forms tend to be larger than related ones from warmer climates. Its bill is also smaller, consistent with Allen's Rule, which predicts reduced appendages in colder climates to minimise heat loss. Examples of Allen's Rule in birds are rare, because birds lack external ears, but the bill is supplied with blood vessels that prevent heat loss, and the Greenland bird's shorter bill fits the prediction precisely.
Research conducted by Middlesex University on two English mallard populations found that mallard vocalisations vary with environment, giving urban and rural birds something resembling a regional accent. Mallards in London were found to be considerably louder and more vocal than those in Cornwall, an adaptation to persistent background noise in cities.
The deep quack stereotypically associated with ducks belongs to the female, not the male. Females call in sequences of 2-10 quacks, starting loud and decreasing in volume. Males produce a similar but deeper and quieter sound. When incubating a nest or tending offspring, females switch to a shorter, truncated call that is highly attractive to ducklings. The repetition and frequency modulation of those calls form the auditory basis for a duckling to identify its own species, a process known as acoustic conspecific identification. Females will hiss if the nest or young are threatened. When taking off, a mallard's wings produce a faint characteristic whistling noise.
The mallard is omnivorous and flexible. During the breeding season, males in one study were recorded eating 37.6% animal matter and 62.4% plant matter, with the grass Echinochloa crus-galli being especially prominent. Non-laying females ate a nearly identical ratio of 37.0% to 63.0%, while laying females shifted dramatically, consuming 71.9% animal matter and only 28.1% plant matter. In 2017, a flock of mallards in Romania was observed hunting fledglings of small migratory birds as they landed in water, including a grey wagtail and a black redstart. That was the first documented case of mallards attacking and consuming large vertebrates. In 2026, the same behaviour appeared again at Lake Alexandrina in New Zealand, where mallards preyed on the chicks of the pūteketeke.
The predation-avoidance behaviour of sleeping with one eye open, keeping one brain hemisphere alert while the other rests, was first demonstrated in mallards, though it is now believed to be widespread among birds generally.
Pairs typically form in October and November in the Northern Hemisphere. The female lays 8-13 creamy white to greenish-buff eggs, each measuring about 58 mm in length and 32 mm in width, on alternate days. Incubation begins when the clutch is nearly complete and takes 27-28 days. The male leaves at the start of the nesting season and joins other males to await the moulting period, which begins in June.
Nesting sites are usually on the ground, hidden in vegetation where the female's speckled plumage provides camouflage. Females have also been recorded nesting in tree hollows, boathouses, roof gardens, and balconies, occasionally leaving newly hatched ducklings stranded far from water. In November 2011, a female successfully hatched and raised eleven ducklings at the London Wetland Centre, an unusually late clutch prompted by unseasonably warm weather.
Filial imprinting keeps ducklings close to their mother not just for warmth but also to learn migratory routes and foraging locations. Female mallards do not tolerate stray ducklings and will aggressively drive them away, sometimes killing them. Mallards are opportunistically targeted by brood parasites; redheads, ruddy ducks, lesser scaup, gadwalls, northern shovellers, northern pintails, cinnamon teal, common goldeneyes, and other mallards have all been recorded laying eggs in mallard nests.
In 2003, a paper describing a documented case of homosexual necrophilia in a male mallard was awarded an Ig Nobel Prize. The paper, which Lebret (1961) and later Stanley Cramp and K.E.L. Simmons (1977) had discussed under the term "Attempted Rape Flight", describes behaviours that extend to forced mating with females of other species and, in one recorded instance, the continued pursuit of a male duck that had died by flying into a glass window. In New Zealand, where mallards are naturalised, nesting seasons have been found to be longer, clutches larger, and nest survival generally greater compared with birds in their native range.
Since 1998 the mallard has been classified as a species of least concern on the IUCN Red List, with a range exceeding 65,000,000 km2 and a population estimated at more than 17 million mature individuals as of 2025. That population is nonetheless decreasing. The conservation concern the mallard poses is not for itself but for everyone else.
The mallard can crossbreed with 63 other species, and has hybridised with more than 40 species in the wild and an additional 20 in captivity. The hybrids are often fertile. As mallards spread into new areas, they interbreed with indigenous wild ducks, a process described as genetic pollution. Complete hybridisation of various species' gene pools could result in the extinction of many indigenous waterfowl.
Relatives already under pressure include the Hawaiian duck, the New Zealand grey duck subspecies of the Pacific black duck, the American black duck, the mottled duck, Meller's duck, the yellow-billed duck, and the Mexican duck. In New Zealand, the grey duck population declined drastically due to overhunting in the mid-20th century, leaving it especially vulnerable to displacement and interbreeding. The Mariana mallard, apparently derived initially from mallard and Pacific black duck hybrids, became extinct in the late 20th century.
In South Africa, mallard hybridisation with the yellow-billed duck is producing fertile offspring capable of themselves breeding, a process the source describes as severe genetic pollution affecting biodiversity, even though the Agreement on the Conservation of African-Eurasian Migratory Waterbirds nominally covers the mallard too. Florida has banned domestic ownership of mallards entirely, specifically to prevent hybridisation with the native mottled duck. The state of the Laysan duck illustrates what partial protection can achieve: nearly extinct in the early 20th century, its range now reduced to Laysan Island from a former spread throughout the Hawaiian archipelago before 400 AD, it has been successfully translocated and survives, though mallards arriving during migration remain a periodic risk.
Almost all domestic duck breeds trace back to the mallard, with the exception of a few Muscovy breeds, and carry the trinomial name A. p. domesticus. Domestication first occurred in Southeast Asia at least 4,000 years ago during the Neolithic Age. The Romans farmed them in Europe and the Malays farmed them in Asia. Wild mallards are monogamous while domestic ducks are mostly polygamous; domestic ducks also lack the territorial aggression of their wild relatives.
Hunting is another long thread in this relationship. In the United Kingdom the mallard is protected under the Wildlife and Countryside Act 1981, which restricts certain hunting methods. The United States Federal Aviation Administration has recorded 1,320 mallard collisions with aircraft since standardised data collection began in 1990, with 261 of those collisions causing damage, through 2022. The mallard ranks as the 7th most hazardous bird to both military and commercial aircraft in the United States. Mallards generally fail to avoid approaching vehicles in experimental settings, especially at high speeds, and at least one mallard has been struck at cruising altitude: 21,000 feet.
The mallard has also found its way into culture. Robert McCloskey's children's picture book Make Way for Ducklings centres on a pair of mallards raising their brood in the Boston Public Garden. A 2023 animated adventure comedy, Migration, produced by Universal Pictures and Illumination, follows a family of mallards living in a New England pond. And perhaps the most celebrated individual mallard was Trevor, a drake who appeared without explanation on the Pacific island of Niue in 2018, was named by locals after New Zealand politician Trevor Mallard, and died there in 2019, having spent his entire documented life far from any typical mallard habitat.
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Common questions
What is the mallard's scientific name and what does it mean?
The mallard's scientific name is Anas platyrhynchos, established as the priority name in 1906 by Einar Lönnberg. It derives from the Latin Anas, meaning duck, and the Ancient Greek platyrhynchus, meaning broad-billed, combining platys (broad) and rhunkhos (bill).
How many species can the mallard crossbreed with?
The mallard can crossbreed with 63 other species. It has hybridised with more than 40 species in the wild and an additional 20 in captivity, and the hybrids are often fertile, posing a significant threat to indigenous waterfowl through genetic pollution.
Why is the mallard considered an invasive species if it is rated least concern by the IUCN?
The IUCN rates the mallard as least concern because its own population, estimated at more than 17 million mature individuals as of 2025, is large and widespread. However, when introduced to new regions, mallards interbreed with indigenous wild ducks, producing fertile hybrids that can erode the genetic identity of native species to the point of extinction.
Which sex of mallard makes the classic quacking sound?
The female mallard makes the deep quack stereotypically associated with ducks. She often calls in sequences of 2-10 quacks, starting loud and decreasing in volume. The male produces a similar but deeper and quieter sound.
How long has the mallard been domesticated?
The mallard was first domesticated in Southeast Asia at least 4,000 years ago during the Neolithic Age. It was also farmed by the Romans in Europe and by the Malays in Asia, and almost all modern domestic duck breeds descend from it.
What is the mallard Trevor and why did it become famous?
Trevor was a male mallard who appeared unexpectedly on the Pacific island of Niue in 2018, an atypical location for the species. Locals named him after New Zealand politician Trevor Mallard. He became a media attraction and died on Niue in 2019, known informally as the world's loneliest duck.
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