In the United States there are more than ten universities and numerous citizen groups that have been studying every aspect of the phenomenon, separately looking into the biology, ecology, migration photoperiod and so forth of the monarch butterfly (Danaus plexippus). Research into Taiwan's crow butterflies has focused on the overwintering valleys, migration routes and breeding sites. These are just the first steps.
詹家龍表示，美國有十多個大學團隊及多個民間團體，分別就大樺斑蝶的生理、行為、生態，遷移的光週期等各方向從事研究，目前國內的紫斑蝶研究先放在越冬谷、遷移路徑和繁殖地，只能算是一個起步。