adult-bird aquatic black black-winged-stilt cautious distance distant dog-bird himantopus himantopus large long-legged longshanks mature pied-stilt protective shore shore-bird shore-line stilt territorial wader wading wading-bird water-bird white white-headed-stilt widespread young wide-spread Australian bird black-bill carnivores carnivorous foraging himantopus-himantopus-leucocephalus long-beaked red-legged reflections ripples rippling sharp-beaked sharp-bill stream thin water himantopus-himantopus