The whistling ducks or tree ducks are a subfamily, Dendrocygninae, of the duck, goose and swan family of birds, Anatidae. Scientific classification: Domain: Eukaryota Kingdom: Animalia Phylum: Chordata Class: AvesOrder: Anseriformes Family: Anatidae Subfamily: Dendrocygninae Genus: Dendrocygna Type species Anas arcuata