Australian bird black-bill black-winged-stilt carnivores carnivorous dog-bird foraging himantopus-himantopus-leucocephalus long-beaked long-legged longshanks pied-stilt red-legged reflections ripples rippling sharp-beaked sharp-bill stilt stream thin wader wading water water-bird white-headed-stilt aquatic black cautious himantopus-himantopus mature shore-bird territorial wading-bird white wide-spread Australia black swan Cygnus atratus emblem emblematic fauna gregarious iconic large life pairs pair protected protected species red beaked red eyed river social swan swans swimming symbol symbolic water bird Western Australian State emblem black-swan curved-neck cygnus-atratus dark elegance elegant long-necked protected-species red-beaked red-eyed Western-Australian-State-emblem wildlife