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The whistling ducks or tree ducks are a subfamily, Dendrocygninae of the duck, goose and swan family of birds, Anatidae. They are not true ducks. In other taxonomic schemes, they are either considered a separate family Dendrocygnidae, or a tribe Dendrocygnini in the goose subfamily Anserinae. The subfamily has one genus, ''Dendrocygna'', which contains eight living species, and one undescribed extinct species from Aitutaki of the Cook Islands. == Taxonomy and evolution == Whistling ducks were first described by Carl Linnaeus in the 10th edition of ''Systema Naturae'' in 1758: the black-bellied whistling duck (then ''Anas autumnalis'') and the West Indian whistling duck (then ''Anas arborea''). In 1837, William John Swainson named the genus ''Dendrocygna'' to distinguish whistling ducks from the other waterfowl. The type species was listed as the wandering whistling duck (''D. arcuata''), formerly named by Thomas Horsfield as ''Anas arcuata''. Whistling duck taxonomy, including that of the entire infraorder Anseriformes, is complicated and disputed. Under a traditional classification proposed by ornithologist Jean Théodore Delacour based on morphological and behavioral traits, whistling ducks belong to the tribe Dendrocygnini under the family Anatidae and subfamily Anserinae. Following the revisions by ornithologist Paul Johnsgard, Dendrocygnini includes the genus ''Thalassornis'' (the white-backed duck) under this system. In 1997, Bradley C. Livezey proposed that ''Dendrocygna'' were a separate lineage from Anserinae, placing it and its tribe in its own subfamily, Dendrocygninae. Alternatively Charles Sibley and Jon Edward Ahlquist recommended placing ''Dendrocygna'' in its own family, Dendrocygnidae, which includes the genus ''Thalassornis''. } |2=Anseranatidae (magpie-geese) }} |2=Anhimidae (screamers) }} }} }} | align="center" | }} }} |2= }} }} |2= }} |2=''Thalassornis''|barbegin2=blue|barend2=blue }} |2= }} }} }} }} |} 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「whistling duck」の詳細全文を読む スポンサード リンク
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