In the beginning of June 2004, Chan Chia-lung was told that in horsetail-tree windbreak plantations in Long Life Forest Park on the Miaoli coast at Chunan there were large numbers of empty chrysalises and dead butterflies that hadn't completely emerged.
2004 年 6 月初，詹家龍接獲民眾通報，在苗栗竹南海濱的木麻黃防風林（又稱「長青之森」公園），有大量蝶蛹空殼和羽化不全的蝶屍。