But evidence concerning the White-Headed Weng from the nineteenth and mid-twentieth centuries makes it apparent that the extent of the bird in Taiwan only ranged from the area west of the Langyang Plain south to Chaochou in Pingtung county and the Tawu range of mountains.
但由十九世紀到廿世紀中葉有關白頭翁的記錄資料則顯示，白頭翁在台灣的勢力範圍，只及於蘭陽平原以西，向南延伸至屏東潮州、大武山一帶。