The Anatinae is one of the subfamilies of the family Anatidae, which includes the swans, geese and ducks. (See Anatidae for an overview of this group of birds.)
The Anatinae subfamily contains two groups of ducks:
The dabbling duck group, of worldwide distribution, include 10 genera and about 55 species:
Pteronetta hartlaubi (Hartlaub's Duck)
Cairina (Muscovy Duck and White_winged Wood Duck, 2 species)
The 16 species of diving ducks, of worldwide distribution, in 3 genera; Marmaronetta was formerly included with the dabbling ducks but is now treated here, and genetic analysis of the extinct Pink-headed Duck of India, previously treated separately in Rhodonessa, has shown that it is better placed in Netta:
The 16 species of diving duck, also known as pochards, make up a sub-group of the biological subfamily Anatinae, which itself is part of the diverse and very large duck, goose and swan family, Anatidae.
The latter article should be referred to for an overview of this very large family of birds.
Diving ducks do not walk as well on land as the dabbling ducks; their legs tend to be placed further back on their bodies help propel them when underwater.
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