|Male (rear) and female (front) Eurasian Wigeons|
The wigeons are dabbling ducks in the genus Anas. There are three extant species: the Eurasian Wigeon (Anas penelope), the American Wigeon (A. americana) and the Chiloé Wigeon (A. sibilatrix). A fourth species, the Amsterdam Island Duck (Anas marecula), is believed to have become extinct around 1800.
Widgeon is an alternative, though archaic, spelling; the American Wigeon has in the past been known as the Baldpate. All three are similarly shaped, with a steep forehead and bulbous rear to the head. Males have a distinctive breeding plumage, in their eclipse plumage they resemble females, which are similar in appearance year-round. The three species' closest relatives within the genus Anas are the Gadwall and the Falcated Duck. All three wigeon species hybridise in captivity, and American and Eurasian Wigeons hybridise in the wild. An American Wigeon × Mallard hybrid has also been recorded.
- Johnson, KP; Sorenson, MD (1999). "Phylogeny and biogeography of dabbling ducks (genus: Anas): A comparison of molecular and morphological evidence". The Auk 116 (3): 792–805. doi:10.2307/4089339.
- Jiguet, Frédéric (1999). "Photo-forum: hybrid American Wigeons". Birding World 12 (6): 247–52.
- Carey, Geoff J. (1993) Hybrid male wigeon in East Asia Hong Kong Bird Report 1992 160-6
- Fedynich, Alan M. and Rhodes, Olin E., Jr. (1993). Mallard × American Wigeon Hybrid on the Southern High Plains of Texas. doi:10.2307/3672079.
- Bailey HH (1919). "An interesting hybrid of Mareca penelope (Widgon) and Mareca americana (Baldpate)". Wilson Bulletin 31: 25.
- Cox C, Jessie B. Birding. 37(2): 156–164 Aging of American and Eurasian Wigeons in female-type plumages http://www.aba.org/birding/v37n2p156.pdf Aging of American and Eurasian Wigeons in female-type plumages
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- Harrison JM, Harrison JG (1968). "Wigeon × Chiloé Wigeon hybrid resembling American Wigeon". British Birds 61: 169–171.
- Harrop A (1994). "Photo-forum: a presumed hybrid American Wigeon in Grampian". Birding World 7: 116–7.
- Harrop A (1994). "Field identification of American Wigeon". Birding World 7: 50–56.
- Jiquet F (1999). "Photo forum: Hybrid American Wigeons". Birding World 12: 247–252.
- Larkin P (2000). "Eyelid colour of American Wigeon". British Birds 93: 39–40.
- MacKay A (1996). "Hybrid wigeon resembling American Wigeon in Leicestershire". Birding World 9: 146–7.
- Shiota T (1987). "A challenge in the identificaiton of hybrid American and Eurasian Wigeon". Yacho 496: 6, 18–19.
- Votier SC, Harrop AHJ, Denny M (2003). "A review of status and identification of American Wigeon in Britain and Ireland". British Birds 96: 2–22.
- Watson GE (1970). "A presumed wild hybrid Baldpate × Eurasian Wigeon". The Auk 87 (2): 353–7. doi:10.2307/4083926.
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