The reason for the difference, an ornithologist says, is "that showing off to the female is an important duty for the male." He explains that pheasants are generally polygamous in nature, and so the males must be rather outstanding in appearance to compete in attracting a harem.
男女有別的原因為「向雌鳥『炫耀』是雄雉很重要的任務」，一位鳥類學家說明，雉科鳥多是一夫多妻，雄鳥為吸引后宮三千佳麗，外型自然較出眾。