Aix
The genus belongs to the family Anatidae in the waterfowl order Anseriformes. They were formerly placed in the "perching ducks" Group.
The two species are generally considered to be very attractive, particularly the multi-coloured drakes. Wood Ducks are a North American species,[3] occurring mainly in the eastern half of the United States, and from southern Canada to northern Mexico. Mandarin Ducks are an Asian species mainly in Japan and China, but there is an important feral population in the United Kingdom. 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.
Both species are threatened by loss of habitat. As human development continues to expand, the woodland areas preferred by these ducks continues to shrink. The Mandarin Ducks may number less than 20,000.
The Mandarin Duck (Aix galericulata), or just Mandarin, is a medium-sized perching duck, closely related to the North American Wood Duck. It is 41–49 cm long with a 65–75 cm wingspan.
The species was once widespread in eastern Asia, but large-scale exports and the destruction of its forest habitat have reduced populations in eastern Russia and in China to below 1,000 pairs in each country; Japan, however, is thought to still hold some 5,000 pairs.
More information can be found on Wikipedia.
The Wood Duck is a medium-sized perching duck. A typical adult is from 47 to 54 cm (19 to 21 in) in length with a wingspan of between 66 to 73 cm (26 to 29 in). This is about three-quarters of the length of an adult Mallard. It shares its genes with the Asian Mandarin Duck (Aix galericulata).
Their breeding habitat is wooded swamps, shallow lakes, marshes or ponds, and creeks in eastern North America, the west coast of the United States and western Mexico. They usually nest in cavities in trees close to water, although they will take advantage of nesting boxes in wetland locations if available.
More information can be found on Wikipedia.