Once the caterpillars have eaten away all the milkweed leaves, the plant's outer layers become targets, and in the face of growing numbers of hatchlings, the food shortages become increasingly dire.
幼蟲們不僅將所有馬利筋的葉子蠶食精光，連樹皮也不放過，面對著陸續孵化的幼蟲，食物的短缺更是嚴重。