Pilot tracks monarch butterflies on long migration - Yahoo! News
I heard this man's story on NPR. Factoids:
"Not one butterfly makes the round-trip journey, and the offspring of those who start it head instinctively for a place they have never been.
After leaving Mexico, it takes three or four generations of monarch butterflies to reach their summer grounds in Canada and northern areas of the United States. The last generation, which has a longer life span, then makes the journey south to Mexico for the winter."
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