For faster navigation, this Iframe is preloading the Wikiwand page for Aix (bird).

Aix (bird)

Pair of wood ducks (Aix sponsa)
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Anseriformes
Family: Anatidae
Subfamily: Anatinae
Genus: Aix
F. Boie, 1828
Type species
Aix sponsa

Aix is a bird genus that contains two species of ducks: the wood duck (Aix sponsa), and the mandarin duck (Aix galericulata). Aix is an Ancient Greek word used by Aristotle to refer to an unknown diving bird.[1]


The genus belongs to the family Anatidae in the waterfowl order Anseriformes. They were formerly placed in the "perching ducks", a paraphyletic group somewhat intermediate between shelducks and dabbling ducks, and it is not quite clear whether they should be placed in the Anatinae (dabbling duck) or Tadorninae (shelduck) subfamily.[2][3]

Extant species

Genus AixF. Boie, 1828 – two species
Common name Scientific name and subspecies Range Size and ecology IUCN status and estimated population
Wood duck

Aix sponsa
(Linnaeus, 1758)
North American species,[4] eastern half of the United States, and from southern Canada to northern Mexico
Map of range
Size: The wood duck has a mass of 500–700 grams (18–25 oz). It is 41–49 centimeters (16–19 in) in length, and has a wingspan of 73–75 cm (29–30 in). Males have red eyes and iridescent plumage. Both sexes have crested heads.



Mandarin duck

Aix galericulata
(Linnaeus, 1758)
Asian species occurring mainly in Japan and China; introduced populations can be found in the United Kingdom, Western Europe and isolated areas of North America
Map of range
Size: The Mandarin duck is 41–49 cm (16–19 in) long with a 65–75 cm (26–30 in) wingspan. It has an even more flamboyant plumage than the wood duck. The female Mandarins are less brightly colored than the males.




Both species migrate from the northern parts of their respective ranges to winter in the south of the range. They inhabit quiet wooded streams and ponds.


The two species are generally considered to be very attractive, particularly the multi-coloured drakes. The genus shows marked sexual dimorphism (differences between the sexes), with the females being smaller and less colorful.

Mandarin duck (Aix galericulata)


Wood ducks will consume small crustaceans, insects, and plant matter. Mandarin ducks are mainly vegetarian.


Wood ducks are reproductively capable around the age of one year. They are monogamous for the season. Mating occurs between February and April, depending on latitude. The clutch size is between 6 and 15, and the incubation period is about 30 days. The young are precocial. They venture from the cavity nest at one day old and are cared for by the mother for about 60 days. The young have a very high mortality rate. Wood ducks normally live 3 to 4 years.

Mandarin ducks are also monogamous. The courtship ritual, like the plumage, is rather showy. The female lays between 9 and 12 eggs in a cavity nest, then incubates them for about 30 days. Parental care by the mother is a little shorter in this species, lasting about 40 days.


Both species are affected by loss of habitat. As human development continues to expand, the woodland areas preferred by these ducks continues to shrink. As of 2016, both species had been evaluated for the Red List of the International Union for Conservation of Nature (IUCN), and given a "least concern" rating.[5][6]


  1. ^ Jobling, James A (2010). The Helm Dictionary of Scientific Bird Names. London: Christopher Helm. p. 37. ISBN 978-1-4081-2501-4.
  2. ^ Johnson, Kevin P.; Sorenson, Michael D. (1999). "Phylogeny and biogeography of dabbling ducks (genus Anas): a comparison of molecular and morphological evidence" (PDF). Auk. 116 (3): 792–805. doi:10.2307/4089339. JSTOR 4089339. Retrieved September 2, 2008.
  3. ^ Madge, Steve; Burn, Hilary (1987). Wildfowl : an identification guide to the ducks, geese and swans of the world. London: Christopher Helm. ISBN 978-0-7470-2201-5.
  4. ^ "Wood Duck (Aix sponsa)". Northern Prairie Wildlife Research Center. United States Geological Survey. August 3, 2006. Archived from the original on 2006-05-06. Retrieved June 29, 2010.
  5. ^ Birdlife International (2012). "Aix galericulata". IUCN Red List of Threatened Species. 2012. doi:10.2305/IUCN.UK.2012-1.RLTS.T22680107A40697187.en. Retrieved 2016-08-08.
  6. ^ Birdlife International (2012). "Aix sponsa". IUCN Red List of Threatened Species. 2012. doi:10.2305/IUCN.UK.2012-1.RLTS.T22680104A40111785.en. Retrieved 2016-08-08.

Further reading

  • Harris, M. (1999): Animal Diversity Web: Aix galericulata . Accessed April 27, 2006.
  • Pope, A. (2004): Animal Diversity Web: Aix sponsa. Accessed April 27, 2006.
{{bottomLinkPreText}} {{bottomLinkText}}
Aix (bird)
Listen to this article

This browser is not supported by Wikiwand :(
Wikiwand requires a browser with modern capabilities in order to provide you with the best reading experience.
Please download and use one of the following browsers:

This article was just edited, click to reload
This article has been deleted on Wikipedia (Why?)

Back to homepage

Please click Add in the dialog above
Please click Allow in the top-left corner,
then click Install Now in the dialog
Please click Open in the download dialog,
then click Install
Please click the "Downloads" icon in the Safari toolbar, open the first download in the list,
then click Install

Install Wikiwand

Install on Chrome Install on Firefox
Don't forget to rate us

Tell your friends about Wikiwand!

Gmail Facebook Twitter Link

Enjoying Wikiwand?

Tell your friends and spread the love:
Share on Gmail Share on Facebook Share on Twitter Share on Buffer

Our magic isn't perfect

You can help our automatic cover photo selection by reporting an unsuitable photo.

This photo is visually disturbing This photo is not a good choice

Thank you for helping!

Your input will affect cover photo selection, along with input from other users.


Get ready for Wikiwand 2.0 🎉! the new version arrives on September 1st! Don't want to wait?