The researchers have already discovered that the White-Headed Weng is on average larger than the Wu-T'ou and that the latter's nesting season comes about two weeks later than the White-Headed Weng.
研究人員已發現：白頭翁平均體型比烏頭翁大，烏頭翁繁殖季節比白頭翁晚半個月。