After 1970, the number of butterflies suddenly dropped around Puli due to severe habitat destruction. The center of butterfly harvesting activities moved southward, while processing moved to the north. Ong Sheng-keng, based in Taipei's Beitou, was a typical example. Besides dealing in the specimens trade, he also eagerly sold butterfly wing collages around the world.
1970 年以後，埔里因棲地遭受嚴重破壞，蝶量驟減，來源移向南部，加工廠則遷往北部，又以北投的王生鏗最具代表性，他除了標本買賣外，「蝶翅貼畫」更熱銷世界各國，這些讓世人驚豔不已的蝴蝶，曾在 1968 ~ 75 年間，以每年 1,500 萬到 5 億隻的數量出口，賺進豐厚外匯。