When autumn arrives in the United States and Canada, you can see one of nature's greatest scenes—the yearly migration of the monarch butterflies.

在美国和加拿大的秋天到来时，你可以看到大自然最壮观的景象之一——帝王蝶一年一度的迁徙。

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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。

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Monarch butterflies spend 3 months flying from Canada to Central Mexico.

黑脉金斑蝶要花三个月的时间从加拿大飞到墨西哥中部。

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Researchers continue to make discoveries about how monarch butterflies travel to the same area each year.

VOA: special.2010.04.27

Monarch butterflies stop to rest on their way south for the winter.

VOA: special.2009.06.01

He was so inquisitive and his favorite thing to do was hatching Monarch butterflies.

CNN: Yates writes letter about her children

She said the company has not yet conducted its own research on Bt's impact on monarch butterflies, but they have found no impact on several other insect species in previous tests.

CNN: Researchers find bio-engineered corn harms butterflies

Cornell's laboratory research suggests that wind-blown pollen from the Bt corn could disrupt the monarch caterpillar's feeding -- often killing them before they metamorphose from caterpillars to butterflies.

CNN: Researchers find bio-engineered corn harms butterflies