bird crane egret Heron lake nature swamp water gull loon flight stream ocean seagull feathers flow leg mono one river shallow birds grass green landscape moon panorama tree Ardea-picata Australian black-winged blue-black carnivores carnivorous crest crested lakeside long-legged pied-egret Pied-Heron reeds reedy sharp-beaked sharp-bill thin wader wading water-bird White-headed-Egret yellow-bill yellow-legged pond sea sky swan swimming