beak bird black bill black crown bright eyed cinnamon cleaning colored coloring colors coloured colouring colours fauna head plumes Heron long white head plumes long yellow legs Nankeen night heron nocturnal nuptial plumes nycticorax caledonicus omnivore omnivorous perched plumes rufous night heron secretive sharp sharp eyed shy stocky waterbird widespread wildlife black-bill black-crown bright-eyed head-plumes long-yellow-legs Nankeen-night-heron nuptial-plumes nycticorax-caledonicus plumage rufous-night-heron sharp-eyed grooming preening