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The Mallard: The World’s Most Familiar Duck
If you have ever seen a duck, you have almost certainly seen a mallard. It is also the ancestor of nearly every domestic duck breed on earth.
Key takeaways
- The mallard is the most widespread and familiar duck across North America, Europe and Asia.
- Nearly every domestic duck breed descends from the mallard — the Muscovy is the exception.
- The green-headed bird is the male; the mottled brown bird is the female, and she is the one who quacks.
- In late summer, drakes moult into dull 'eclipse' plumage and look almost like females.
The duck everyone knows
Green head, yellow bill, white neck ring, grey body: the mallard drake is the default image of a duck almost everywhere in the world. Mallards live across North America, Europe and Asia, and have been introduced well beyond that. Park ponds, city rivers, farm ditches, salt marshes and mountain lakes all suit them, which is exactly why they are the duck you have already seen.
Male and female look nothing alike
The mottled brown bird beside the green-headed one is not a different species. She is the female, and her camouflage is doing an important job: she is the one sitting on a nest on the ground for four weeks. She is also the one making the loud quacking. The drake’s call is quieter and raspier.
Both share one giveaway feature — the speculum, a patch of iridescent blue on the wing bordered with white, visible in flight and often at rest.
The disappearing drake
In late summer, drakes moult into what is called eclipse plumage. They lose their flight feathers all at once and cannot fly for a few weeks, so the bright colours would be a liability. They go brown and inconspicuous, hide in cover, and come back into full colour in autumn. Many people assume the drakes have left. They are still there.
The ancestor of almost every domestic duck
Pekin, Aylesbury, Rouen, Runner, Khaki Campbell, Call — nearly every domestic duck breed traces back to the mallard, shaped by centuries of selection for meat, eggs or appearance. The one common exception is the Muscovy, which comes from a separate South American species and behaves differently: it hisses instead of quacking, perches, and has clawed feet.
Nesting and broods
A mallard nests on the ground, usually in thick cover and sometimes surprisingly far from water. A typical clutch is 8 to 12 eggs, incubated for about 28 days. The ducklings leave the nest within a day of hatching, and the female leads them to water.
A success story with a complication
Mallards adapt to people better than almost any other duck, which is why they thrive in cities. That same adaptability makes them a problem where they have been introduced: they interbreed readily with related species, and in some regions that hybridisation is a genuine threat to local duck populations.
Frequently asked questions
Why do male mallards look dull in summer?
After breeding, drakes moult into eclipse plumage and lose their flight feathers for a few weeks. Being flightless, they need camouflage, so the bright green head and grey body are replaced by mottled brown until autumn.
Are mallards native everywhere?
They are native across much of the northern hemisphere and introduced elsewhere, including parts of the southern hemisphere, where they can hybridise with local duck species — a real conservation concern in places like New Zealand.
Do mallards mate for life?
No. They pair up each season, and the pair bond typically breaks once the female is incubating. Geese and swans are the long-term pair bonders; mallards are not.
Which domestic ducks come from mallards?
Almost all of them: Pekin, Runner, Khaki Campbell, Aylesbury, Rouen, Call ducks and more. The Muscovy is the exception, descending from a separate South American species.
