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Which Anseriformes subfamily includes whistling ducks?

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mallard — Anseriform Mallard (*Anas platyrhynchos*).

Whistling ducks belong to the subfamily Dendrocygninae.1

While some classification systems categorize them as a tribe (Dendrocygnini) within the subfamily Anserinae, other taxonomic frameworks recognize them as their own distinct subfamily, Dendrocygninae, which comprises nine species across two genera. These birds are characterized by their whistling voices, relatively long legs, and upright stance.21