What troubles ornithologists about this is that, if it continues, then there will only be White-Headed and Mixed-Headed Weng left. Wu-T'ou Weng could become the most numerous of Taiwan's unique species at present--but the earliest to become extinct.
鳥類學者擔心的是，如此長久下去，將只剩白頭翁與雜頭翁，烏頭翁可能成為「目前數量最多、卻將最早絕種的台灣特有種」。