To date, Tsai has photographed 350 species of butterflies, but those that he has yet to capture on film include the diminutive Malayan butterfly (Megisba malaya sikkima), Euaspa tayal, which dwells only in ravines on Ilan's Mt. Fu, and the silver-washed fritillary (Argynnis paphia formosicola), which lives in ancient redwood forests in Taroko National Park.
蔡百峻目前已拍攝 350 種蝴蝶，尚未入列的包括體型嬌小的「黑姬星小灰蝶」、只活動於宜蘭福山附近斷崖地形的「泰雅小灰蝶」、還有藏身太魯閣國家公園碧綠神木一帶的「綠豹紋蝶」等少數蝶種。