Atlas of Living Australia (ALA) via https://bie.ala.org.au/species/

Plumed Whistling-Duck

Dendrocygna eytoni

The plumed whistling duck (Dendrocygna eytoni), also called the grass whistling duck, is a species of bird in the whistling duck subfamily of the family Anatidae. It is resident and breeds in Australia, in a broad arc covering the northern half and most of the eastern third of the continent. There are also non-breeding and seasonally uncertain populations in New Zealand, the Solomon Islands, Indonesia and Papua New Guinea. It is a predominantly brown-coloured duck with a long neck and characteristic plumes arising from its flanks. The sexes are similar in appearance.