Caterpillars of monarch butterflies feed exclusively on milkweed leaves.
黑脉金斑蝶的毛虫只吃马利筋的叶子。
The Washington Post reported, one of the main reasons, experts say, is that farmers have used herbicides on the milkweed plants that these butterflies feed on.
《华盛顿邮报》报道，专家说，主要原因之一是，农民对马利筋植物使用除草剂，而这些蝴蝶以马利筋植物为食。
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