American Wigeon
Mareca americana
The American wigeon is a medium-sized bird; it is larger than a teal but smaller than a pintail. In silhouette, the wigeon can be distinguished from other dabblers by its round head, short neck, and small bill. It is 42–59 cm (17–23 in) long, with a 76–91 cm (30–36 in) wingspan and a weight of 512–1,330 g (1.129–2.932 lb). This wigeon has two adult molts per year and a juvenile molt in the first year, as well. The breeding male (drake) is a striking bird with a mask of green feathers around its eyes and a cream-colored cap running from the crown of his head to his bill.
ID text from Wikipedia, CC BY-SA 4.0
Eurasian Wigeon
Mareca penelope
This dabbling duck is 42–52 cm (17–20 in) long with a 71–80 cm (28–31 in) wingspan, and a weight of 500–1,073 g (1–2 lb). The breeding male has grey flanks and back, with a black rear end, a dark green speculum and a brilliant white patch on upper wings, visible in flight or at rest. It has a pink breast, white belly, and a chestnut head with a creamy crown. In non-breeding (eclipse) plumage, the drake looks more like the female. The female is light brown, with plumage similar to that of a female American wigeon.
ID text from Wikipedia, CC BY-SA 4.0

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