American Wigeon (Mareca americana)

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Image of an American widgeon
Birds Duck

Introduction

The American Wigeon (Mareca americana) is a medium-sized, migratory dabbling duck native to North America. It is recognised by its compact shape, short pale bill, distinctive whistled calls and preference for grazing on grasses and other vegetation as well as feeding in wetlands. The species is also known as the baldpate, a reference to the adult male’s conspicuous white crown.

Physical Description

The American Wigeon measures approximately 42–59 cm in length. Its wingspan is about 76–91 cm, although measurements vary between sources and individuals. It has a rounded head, short neck and relatively short, pale blue-grey bill with a dark tip.

The adult male in breeding plumage has a grey-brown head with a broad white crown stripe and an iridescent green patch extending behind the eye towards the nape. Its body is mainly pale cinnamon or pinkish-brown, with contrasting white patches on the sides of the rump and dark undertail feathers. In flight, the white wing coverts and green speculum are useful identification features.

The female is less boldly patterned, with mottled brown plumage, a greyish or brownish head and a darker smudge around the eye. Both sexes share the species’ characteristic shape and pale bill. Males become duller in eclipse plumage and may then resemble females more closely, although some head patterning can remain visible. Juveniles are generally browner and less contrasting than adults.

Range and Habitat

American Wigeons breed across Alaska, much of Canada and parts of the northern and western United States. Important breeding habitats include shallow freshwater marshes, ponds, lakes, rivers and wet grasslands in tundra, boreal forest and prairie regions. Females usually place their nests on dry ground in nearby grassland or fields, sometimes well away from open water.

Most birds migrate south in autumn. Wintering areas extend across the southern United States, Mexico and parts of Central America, with smaller numbers occurring in the Caribbean and elsewhere outside the regular range. Large concentrations occur in California’s Central Valley, along the Gulf Coast and in wetlands of the southern and south-eastern United States.

During migration and winter, the species uses freshwater marshes, reservoirs, lakes, rivers, estuaries, bays, tidal flats, flooded fields and managed wetlands. It also regularly grazes in pastures, parks, lawns and golf-course ponds. American Wigeons occur across all four North American flyways but are particularly numerous in the Pacific and Central flyways.

Behaviour and Diet

American Wigeons are active, social ducks that often gather in large flocks, especially during autumn migration and winter. They usually migrate by day and may travel between feeding areas and open-water roosts in the morning and evening. They are wary birds and often flush readily when approached.

The diet consists mainly of plant material. American Wigeons graze on grasses, clover, sedges and agricultural plants on land, and take aquatic vegetation such as duckweed, wigeon grass, cattails and water milfoil from the water’s surface or just below it. Their short bill is well suited to plucking vegetation from fields and lawns.

They sometimes feed near diving ducks, American Coots and swans, taking plant material brought to the surface by those birds. This behaviour is a form of kleptoparasitism, although the species also obtains most of its food independently. Insects and other aquatic invertebrates, including snails and water beetles, become more important during the breeding season, particularly for females preparing to lay eggs.

Pairs commonly form on wintering grounds or during migration. Courtship includes head dipping, tail wagging, body shaking, wing movements and the male’s characteristic whistle. After pairing, the male usually remains with the female into the early part of incubation before departing to moult or join other males.

The female selects a concealed ground site among tall grass or low vegetation. She lines a shallow nest depression with grasses, other plant material and down. A clutch usually contains about 9–11 creamy white eggs, although reported clutch sizes range from 3 to 13 eggs. Incubation lasts approximately 22–28 days. The ducklings are down-covered and mobile soon after hatching, leaving the nest within about a day and feeding themselves.

Identification Tips

  • Look for a medium-sized duck with a rounded head, short neck and short pale bill.
  • In breeding plumage, the male’s white crown, green eye patch, cinnamon body and white rump sides are distinctive.
  • Females are mottled brown, but their compact shape, pale bill and dark eye smudge help separate them from many other dabbling ducks.
  • In flight, note the broad white wing patch and green speculum.
  • Listen for the male’s clear, high-pitched whistle, often rendered as “whee-whee-whee” or “whew-whew-whew”. Females give lower, harsher calls.
  • The Eurasian Wigeon (Mareca penelope) is the most relevant comparison where the species overlap. Adult male Eurasian Wigeons have a rufous head and grey body rather than the American Wigeon’s green-and-white head pattern. Female Eurasian Wigeons are generally more strongly patterned and warmer brown, so body shape, bill colour, head pattern and wing markings should be considered together.

Conservation Status

The American Wigeon is assessed as Least Concern globally. It remains widespread and common, but this status does not mean that all populations are stable. North American monitoring indicates a mixture of regional trends. The North American Breeding Bird Survey reported a substantial long-term decline during 1966–2019, while more recent waterfowl surveys have found no significant overall change in some major survey areas.

The principal concerns are the loss and degradation of wetlands and adjacent grasslands, agricultural conversion, drought in important prairie breeding areas and changing precipitation patterns. Hunting is regulated through waterfowl management programmes, and wetland protection, restoration and habitat management under initiatives such as the North American Waterfowl Management Plan support the species across its range.

Frequently Asked Questions

Where does the American Wigeon live?

It breeds mainly in Alaska, Canada and the northern and western United States. It winters across the southern United States, Mexico and parts of Central America, using wetlands, grasslands, flooded fields and coastal habitats.

What does an American Wigeon eat?

It eats mainly vegetation, including grasses, sedges, clover, aquatic plants and seeds. During the breeding season, it also consumes more insects and other aquatic invertebrates.

How can you identify a male American Wigeon?

The breeding male has a white crown stripe, green feathers behind the eye, a cinnamon-coloured body and a pale blue-grey bill. Its whistled call is another useful clue.

Why is the American Wigeon called a baldpate?

The name refers to the male’s conspicuous white crown, which resembles a bald patch on the top of the head.

Where does the American Wigeon build its nest?

The female usually nests on dry ground in dense grass or low vegetation near a wetland. The nest may be several hundred metres from open water and is typically well concealed.

Is the American Wigeon endangered?

No. The species is currently classified as Least Concern globally. Nevertheless, wetland loss, drought, habitat degradation and regional population declines remain important conservation issues.

References

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