Wildlife Clinic

Species

Mallard

Anas platyrhynchos

The familiar green-headed duck of park ponds, ancestor of most farmyard ducks.

A male mallard swimming on calm blue water, his glossy green head, white collar and yellow bill in profile.

Photo Calibas (edit by Aqwis ) (opens in a new tab) / Wikimedia Commons, CC BY-SA 3.0 (opens in a new tab)

At a glance

Size
About 50 to 65 cm long
Weight
About 1 to 1.3 kg
Habitat
Almost any fresh water: ponds, lakes, rivers, marshes and city parks
Diet
Seeds, plants, insects, snails and grain
In Georgia
Common all year; wild migrants join resident and park birds in winter
Voice
The female's loud "quack"; the male's softer, rasping note
Rabies vector
No

Identification

Male
Glossy green head; white neck ring; chestnut breast; grey body; yellow bill
Female
Mottled brown with an orange-and-black bill
Both
A blue wing patch edged with white on both sides
Told apart from
Mottled duck and American black duck, which are darker and lack the white borders to the wing patch
Told apart from
Domestic ducks, which are often heavier, blotchy or all white and fly poorly
Where to look
Nearly any pond, lake or stream

Behaviour

Mallards dabble, tipping forward to feed below the surface with their tails in the air. They adapt to almost anything, which is why they are the most familiar duck in the world.

Females raise the ducklings alone. The male leaves once incubation begins.

Why they matter

Mallards are the wild ancestor of almost every domestic duck breed, and they have lived alongside people longer than most wild birds. They also carry seeds of wetland plants from pond to pond on their feet and in their gut, helping plants reach new water.

Reproduction and lifecycle

Nest — A bowl of plants and down on the ground, hidden in vegetation, sometimes far from water
Eggs — Usually 8 to 13
Incubation — About 26 to 30 days, by the female alone
Ducklings — Leave the nest within a day; the female leads them to water
Flight — At about eight weeks
Lifespan — Usually a few years; some over twenty

Living around people

  • Mallards nest in gardens, planters and courtyards far from water. A nest in an odd place is best left alone; the mother will walk the ducklings to water.
  • Ducklings following their mother across a road need only time; stopping traffic briefly is the kindest help.
  • Bread swells in a duck's stomach and fills it without nourishing it, and crowds of fed ducks spread disease.
  • Released domestic ducks interbreed with wild mallards and cannot survive long on their own.

Misconceptions

  • A mallard nesting far from water has made a mistake. She will lead the ducklings to water within a day of hatching.
  • Ducklings need to be fed bread. Ducklings feed themselves on insects and plants from the start.
  • A lone duckling can be reunited by putting it anywhere near ducks. Other females may attack it; it needs its own mother or a rehabilitator.

Related species

Seasonal activity

When this species is breeding, and when there are nests on the ground. Mowing during the shaded months is how most nests are found.

Breeding and active nests by month for this species
JanFebMarAprMayJunJulAugSepOctNovDec
BreedingJan: noFeb: noMar: noApr: noMay: noJun: noJul: noAug: noSep: noOct: noNov: noDec: no
Active nestsJan: noFeb: noMar: noApr: noMay: noJun: noJul: noAug: noSep: noOct: noNov: noDec: no
NotesPairs forming; courtship displaysPairs searching for nest sitesEgg layingIncubation; first broodsBroods on the waterLate broods; males moultingAdults flightless for a few weeksYoung flyingFlocks gatherNorthern migrants begin arrivingWintering flocksCourtship begins again

Where it lives

Recorded in 78 states and provinces. Each one links to the other animals there, and to the rehabilitators licensed for them.

If you found one

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