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