Roland Seitre / Budgerigar (Melopsittacus undulatus) flock drinking and bathing in water, Wannoo, Billabong Roadhouse, Western Australia.

Steven David Miller / Whistling kites (Haliastur sphenurus) two in flight, one with prey in talons, over Corroboree Billabong, Mary River, Northern Territory, Australia

Steven David Miller / Australasian darter (Anhinga novaehollandiae) female drying wings after fishing in Corroboree Billabong, Mary River, Northern Territory.

Steven David Miller / Comb-crested jacana (Irediparra gallinacea) male and four eggs. The male incubates the eggs. Corroboree Billabong, Mary River, Northern Territory, Australia.

Steven David Miller / Black-necked stork (Ephippiorhynchus asiaticus) female foraging for fish on bank Corroboree Billabong, Mary River, Northern Territory, Australia.

Steven David Miller / Black-necked stork (Ephippiorhynchus asiaticus) male standing in wetland. Corroboree Billabong, Mary River, Northern Territory, Australia.

Colin Monteath/ Hedgehog House / Sunset on cliff and billabong, Finke River, Glen Helen Gorge, MacDonnell Ranges, Northern Territory, Australia

Colin Monteath/ Hedgehog House / Sunset on cliff and billabong, Finke River, Glen Helen Gorge, MacDonnell Ranges, Northern Territory, Australia

Roland Seitre / Whistling hawk (Milan siffleur) hunting male Budgerigar (Melopsittacus undulatus) with wet wing feathers preventing it from escaping. Wannoo, Billabong Roadhouse, Western Australia.

Steven David Miller / Bird watching hide at Marlgu Billabong, Parry Lagoons Nature Reserve, Wyndham, Western Australia

Steven David Miller / Mary River Houseboats on Mary River's Corroboree Billabong, Northern Territory, Australia, July 2010

Mike Potts / Wandering Whistling Duck (Dendrocygna arcuata) Marlgu Billabong, near Wyndham, Western Australia, June