Later researchers in other areas, such as Chiayi's Tanaiku, Yunlin's Linnei, Changhua's Mt. Pakua, and Taichung's Mt. Tatu, noted butterflies migrating north at rates of about 200 to 350 a minute.
隨後研究人員又在嘉義達娜伊谷、雲林林內、彰化八卦山區、台中大肚山等地觀察到斑蝶類的蝶道，以每分鐘 200 到 350 隻的速度集體北返。