Toward the end of summer when the days and nights get cooler the butterflies that emerge from their chrysalis will make the long 3,000 mile journey south to the Sierra Madre Mountains of Mexico. How they know how to get there is still a mystery to scientist. These butterflies are the great, great grandchildren of the original butterfly that came north. Here is a great site to visit.
http://www.fs.fed.us/monarchbutterfly/migration/index.shtml
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