Chao Jung-tai explains caterpillars '" positive "role: the grubs eat plants, and other animals eat the grubs. They are nutrient converters at the very bottom of the food pyramid, and a source of protein for larger animals.
趙榮台解釋毛毛蟲的「正面」角色：小蟲兒吃花木，其他生物再吃毛毛蟲，它們是金字塔上最基層的生物，扮演食物轉換者，是較大型動物的蛋白質來源。