马利筋中的特殊糖苷在帝王蝶的范围内因地区而异。
The specific glycosides present in milkweed differ from region to region within the monarch butterfly's range.
世界上没有其它蝴蝶能像北美的橙黑相间的帝王蝶一样迁徙。
No other butterfly in the world migrates like the orange and black monarch of North America.
美国鱼类和野生动物管理局表示，自1990年来，近十亿只帝王蝶在越冬地点消失了。
The US Fish and Wildlife Service said that nearly a billion monarchs have disappeared from overwintering sites since 1990.
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