In 1989, the zoological institute of the Academia Sinica undertook an investigation at Taroko Gorge National Park which concluded that only cross-breeds could be found there, with almost no pure White-Headed or Wu-T'ou Weng in sight.
中央研究院動物所民國七十八年針對太魯閣國家公園做調查，結果發現太魯閣峽谷內只見「中間型」，幾乎不見純種白、烏頭翁。