American Wigeon

Informazioni

The American Wigeon is a medium-sized dabbling duck found across North America. Males are distinctive with a white crown and green patch behind the eye, while females are mottled brown. They are primarily herbivorous, grazing on aquatic vegetation and grasses. Known for their whistling calls, they are often found in wetlands, marshes, and agricultural fields.

Dimensioni e longevità

Lunghezza

42-59 cm (16.5-23.2 in)

Apertura alare

76-91 cm (30-36 in)

Peso

600-1300 g (1.3-2.9 lbs)

Longevità

Typically 2-5 years in the wild, with records up to 18 years.

Dieta

Herbivore (primarily aquatic vegetation, grasses, sedges, agricultural crops)

Caratteristiche fisiche

Piumaggio

Adult breeding male: White crown, iridescent green patch from eye to nape, gray face, pinkish-brown breast and flanks, white belly, black undertail coverts, large white patch on forewing (speculum). Adult female: Mottled brown body, grayish head, white belly, smaller white patch on forewing. Non-breeding male (eclipse plumage): Resembles female but often retains some green on head and white on wing.

Forma del becco

Small, short, and bluish-gray with a black tip. The nail at the tip is black.

Colore degli occhi

Dark brown.

Colore delle zampe

Grayish-blue to dark gray.

Caratteristiche distintive

The male's prominent white crown and green eye-patch are unmistakable. Both sexes have a distinctive white patch on the forewing, visible in flight and often at rest. The small bill is also a key feature.

Aspetto giovanile

Juveniles resemble adult females but are generally duller and more uniformly brown, with less distinct markings. The white wing patch is present but may be less prominent.

Cambiamenti stagionali

Males undergo an eclipse plumage after breeding, resembling females, before molting back into their brighter breeding plumage in late summer/early autumn.

Dimorfismo sessuale

Pronounced. Males are much more brightly colored with a white crown and green head patch, while females are duller, mottled brown.

Come identificare

1. 1

   Male Head Pattern

   Look for the bright white crown and iridescent green patch behind the eye. This is the most distinctive field mark for males.

2. 2

   White Wing Patch

   Both sexes, especially in flight, show a prominent white patch on the forewing (secondary coverts). This is a key identifier for both sexes and distinguishes them from most other dabbling ducks.

3. 3

   Bill Size and Color

   Note the relatively small, short, bluish-gray bill with a black tip. This is characteristic of wigeons.

4. 4

   Male Body Plumage

   Observe the pinkish-brown flanks and breast, contrasting with the white belly and black undertail coverts.

5. 5

   Female Plumage

   Females are mottled brown overall, but still possess the small bill and the white wing patch (though sometimes less obvious than in males).

6. 6

   Vocalization

   Listen for the male's distinctive three-note whistle, 'whew-whew-whew'. This is often heard before the bird is seen.

Habitat e areale

Biomi

Wetlands, marshes, shallow lakes, ponds, slow-moving rivers, estuaries, agricultural fields.

Areale geografico

Breeds across Alaska, Canada, and the northern United States. Winters throughout the southern United States, Mexico, Central America, and the Caribbean. Also occurs as a vagrant in Europe and Asia.

Fascia altitudinale

Primarily lowlands, from sea level up to moderate elevations where suitable wetlands exist.

Ambienti preferiti

Shallow freshwater marshes, ponds, and lakes with abundant emergent and submerged vegetation. Also utilizes brackish water and coastal estuaries, especially during migration and winter. Frequently found grazing in flooded fields or short-grass pastures adjacent to water.

Comportamento

Periodo di attività

Diurnal, though they may feed at night, especially during migration or in areas with human disturbance.

Abitudini alimentari

Primarily a grazer, feeding on the leaves, stems, and seeds of aquatic plants, grasses, and sedges. They often 'tip up' to reach submerged vegetation. They are also known to steal food from diving ducks and coots, a behavior known as kleptoparasitism. Occasionally consumes insects and small invertebrates.

Comportamento sociale

Highly social, especially outside the breeding season, forming large flocks. During breeding, pairs are territorial but may nest in loose colonies.

Tipo di volo

Strong, direct, and swift flight with rapid wingbeats. Often flies in tight flocks. The white wing patches are very conspicuous in flight.

Migrazione

Strongly migratory. Northern populations move south for the winter, often covering long distances. They migrate in large flocks, typically from September to November and March to May.

Territorialità

Males defend a small territory around the female during the breeding season, but not typically around the nest site itself.

Riproduzione

Stagione riproduttiva

Late April to early July, peaking in May and June.

Abitudini di nidificazione

Nests are typically built on dry ground, often some distance from water, concealed in dense vegetation such as tall grasses, sedges, or shrubs. The nest is a shallow depression lined with grass, leaves, and down feathers plucked from the female's breast.

Dimensione della covata

6-12 eggs.

Descrizione dell'uovo

6-12 (typically 8-10) creamy white to pale buff eggs, smooth and unspotted. Average size is about 54 x 38 mm.

Periodo di incubazione

24-26 days, primarily by the female.

Periodo di involo

Ducklings are precocial and leave the nest shortly after hatching. They are capable of flight at 45-63 days old.

Cure parentali

Only the female cares for the eggs and young. Males typically leave the female shortly after incubation begins.

Dove trovarlo

Consigli sul campo

1. Look for Grazing Behavior. Unlike many dabbling ducks that filter feed, American Wigeons are often seen grazing on land or tipping up in shallow water to eat vegetation.
2. Listen for Whistles. The male's whistle is a very distinctive sound and can help locate them, especially when they are hidden in vegetation.
3. Scan for White Wing Patches. In flight, the large white patches on the forewings are very noticeable and a reliable identification feature.
4. Observe Social Interactions. Watch for their kleptoparasitic behavior, where they steal food from diving ducks or coots, which can be an interesting observation.

Specie simili

Fatti rapidi

Diet:

Herbivorous, primarily aquatic plants and grasses

Vocalization:

Male: Three-note whistle; Female: Soft 'qua-ack'

Key ID Feature (Male):

White crown, green eye-patch

Key ID Feature (Both Sexes):

White forewing patch

Habitat:

Shallow wetlands, marshes, agricultural fields

Curiosità

• American Wigeons are known for their 'piracy' behavior, often stealing food from other diving ducks like Canvasbacks and Redheads, or even coots, as these birds bring vegetation to the surface.
• The genus name 'Mareca' is derived from a Portuguese word for a small duck, while 'americana' refers to its geographic origin.
• They are one of the most common dabbling ducks in North America and are popular among waterfowl hunters.
• Despite being dabbling ducks, they are quite agile in flight and can take off almost vertically from the water.

Classificazione scientifica

Regno

Animalia

Phylum

Chordata

Classe

Aves

Ordine

Anseriformes

Famiglia

Anatidae

Genere

Mareca

Specie

Mareca americana

Esplora American Wigeon