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How Monarchs Make Their Way to Mexico [Scientific American]
Each year, as winter frosts and frigid air begin to envelop the northeastern U.S. and eastern Canada, monarch butterflies summering in these regions set out on a 3,500-kilometer journey to the mountains of central Mexico. Precisely how the insects find their way to this refuge has long eluded biologists. But new findings may help unravel the mystery. According to a report published online this week in the Proceedings of the National Academy of Sciences, the creatures appear to navigate using the sun.
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