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Friday, May 23, 2003
Long Strange TripMy wife and I once hiked half a day into the Sierra Chincua mountains in Mexico to see where monarch butterflies hang upside-down in trees, flutter around in the sunlight, and reproduce before their descendants start flying north again, to Canada. The trip in each direction takes not just several months, but two or three generations of butterflies. They're hard-wired, in other words, for the route across North America. Here's some new research on how it works, but this older piece on magnetic navigation is even curioser.
posted by Michael Scott Moore |
5:09 PM
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