Steven David Miller / Plumed whistling-duck (Dendrocygna eytoni), three walking in a row. Mackay, Queensland, Australia.

Roger Powell / Family group of Wandering whistling ducks (Dendrocygna arcuata) resting together at lake edge, Fogg Dam, Northern Territory, Australia

Juergen Freund / Plumed whistling duck (Dendrocygna eytoni) on water, Atherton Tablelands, Queensland,Australia.

Brent Stephenson / Three Plumed whistling ducks (Dendrocygna eytoni) swimming across the surface of a small pond, Tamatea, Hawkes Bay, New Zealand, November.

Brent Stephenson / Three Plumed whistling ducks (Dendrocygna eytoni) feeding on short grass, Anderson Park, Tamatea, Napier, Hawkes Bay, New Zealand, September.

Brent Stephenson / Three Plumed whistling ducks (Dendrocygna eytoni) on coast, Tamatea, Hawkes Bay, New Zealand, November.

Marie Read / Mallard (Anas platyrhynchos) male performing "Grunt-Whistle" courtship display, in which he tosses an arc of water droplets into the air while giving a grunting call followed by a sharp whistle, Orang...

Marie Read / Mallard (Anas platyrhynchos) male performing "Grunt-Whistle" courtship display, in which he tosses an arc of water droplets into the air while giving a grunting call followed by a sharp whistle, note...

Barry Mansell / Wandering whistling duck (Dendrocygna arcuata) Captive. Occurs in Australia, Indonesia, Papua New Guinea, Philippines and Timor-leste.

Etienne Littlefair / Plumed whistling-ducks (Dendrocygna eytoni), feeding at the edge of a billabong, Marrakai, Northern Territory, Australia, October.

Tim Laman / Magpie Goose (Anseranas semipalmata) roosting in trees, with Wandering Whistling-Duck (Dendrocygna arcuata) flock in Lotusbird Billabong. Cape York Peninsula, Queensland, Australia. August 2012