bird birds Columba-livia-domestica common domestic-pigeon fancy-pigeons fauna feathers feeders feral flock gregarious iridescence iridescent pests pigeon pigeons plumage plumage-varieties prolific resting roof roofing tiled tiles tiling variations variety appearance color colorful colour colourful columba livia domestica domestic pigeon fancy pigeons ground feeders pigeon pie plumage varieties rock pigeon appetite bread feeding garbage greedy scraps symbol. symbolic white