Come identificare American Wigeon

Per identificare correttamente American Wigeon (Mareca americana), controlla ciascuna di queste caratteristiche. Gli uccelli possono essere complicati da riconoscere, perché comportamento, habitat e canto spesso confermano ciò che una sola foto non può.

Dimensioni a colpo d'occhio

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)

Caratteristiche fisiche da controllare

1. 1

   Piumaggio

   Colorazione e disegno generale del 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.

2. 2

   Forma del becco

   Forma e colore del becco, un segno di campo chiave.

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

3. 3

   Colore degli occhi

   Colore dell'iride e segni distintivi sugli occhi.

   Dark brown.

4. 4

   Colore delle zampe

   Colore di zampe e piedi.

   Grayish-blue to dark gray.

5. 5

   Caratteristiche distintive

   Tratti distintivi che separano questa specie.

   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.

6. 6

   Aspetto giovanile

   Come i giovani si differenziano dagli adulti.

   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.

7. 7

   Cambiamenti stagionali

   Variazione del piumaggio tra stagione riproduttiva e non.

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

8. 8

   Dimorfismo sessuale

   Differenze tra maschi e femmine.

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

Segni di campo chiave

• 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.
• 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.
• Bill Size and Color. Note the relatively small, short, bluish-gray bill with a black tip. This is characteristic of wigeons.
• Male Body Plumage. Observe the pinkish-brown flanks and breast, contrasting with the white belly and black undertail coverts.
• 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).
• Vocalization. Listen for the male's distinctive three-note whistle, 'whew-whew-whew'. This is often heard before the bird is seen.

Esplora American Wigeon