Anderson Cooper on witnessing the monarch butterfly migration
The annual migration of monarch butterflies is one of science's great mysteries: millions of monarchs know the correct path even though they have never made the long journey themselves. As 60 Minutes found, the expedition to watch the migration can be its own challenge.
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The annual migration of monarch butterflies is one of science's great mysteries: millions of monarchs know the correct path even though they have never made the long journey themselves. As 60 Minutes found, the expedition to watch the migration can be its own challenge.
