In the 1970s, ornithologists discovered an overlap in the territories of the White-Headed and Wu-T'ou Weng, along the cross-island highway to Hualien and the north of Fengkang.
一九七○年代，鳥類學者陸續在中橫、花蓮及楓港北部發現烏、白頭翁領域有重疊現象。