Recent surveys by butterfly watching groups in Taiwan have shown that this year in "Yellow Butterfly Valley" near Meinung in Kaohsiung County, where some 10 million butterflies usually appear over the course of the butterfly season from April to October, the numbers have fallen to only about 100,000, and of the 80 species normally found there, only 50 have been observed.
近來台灣賞蝶團體的調查就發現，過去每年四月至十月可以持續出現上千萬隻蝴蝶的美濃黃蝶翠谷，今年卻只有十萬隻左右。原有的八十種蝴蝶，今年也驟降為五十種。