The plumed whistling duck (Dendrocygna eytoni), also called the grass whistling duck, is a whistling duck that breeds in Australia. It is a predominantly brown-coloured duck with a long neck and characteristic plumes arising from its flanks. The sexes are similar in appearance. Measuring 42–60 cm and weighing around one kilogram, it is a long-necked duck with brown upperparts, paler underparts and a white rump. The chest is chestnut with thin black bars, while long black-margined plumes arise from its flanks. Its bill and legs are pink, and its iris is yellow. The male and female are similar in appearance.The species has a characteristic lowered neck and short, dark, rounded wings while flying. The call is a characteristic whistle which gives the bird its common name.