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Monarch butterflies, the large origin black insects, are common summer sights in northern United States and Canada.
出自-2014年6月听力原文
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What makes monarch butterflies particularly interesting is they migrate, all the way to California or Mexico in back
出自-2014年6月听力原文
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Every year in the late summer, monarch begin their migration to the south, those heading for Mexico go first for the Louisiana Mississippi region.
出自-2014年6月听力原文
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The average monarch lives about nine month
出自-2014年6月听力原文
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Scientists learn about the monarch butterflies' migration by capturing and placing the identifying tags in the insects.
出自-2014年6月听力原文
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By recapturing the attempt of the monarch and noting where they came from, the next scientist can figure out things like butterfly's age and its routing
出自-2014年6月听力原文
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What is the unique about the monarch butterfly according to the speaker?
出自-2014年6月听力原文
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What does the speaker say about the monarch butterflies' reproduction
出自-2014年6月听力原文
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Evolution of monarch butterflies.
出自-2014年6月听力原文
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Living habits of monarch butterflies
出自-2014年6月听力原文
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Migration patterns of monarch butterflies.
出自-2014年6月听力原文
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Environmental impacts on monarch butterfly life
出自-2014年6月听力原文
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Each side provides the winter home for millions of monarchs.
出自-2014年6月听力原文