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 Monarch Butterflies of Michoacan 
Monarch Butterflies are found throughout most of the United States and Canada. With the arrival of fall, it's time for them to vacate their breeding grounds and fly south where winter temperatures are mild. A certain mountain refuge in central Mexico's Michoacan state (about 100 miles west of Mexico City) is where the grandchildren and great- grandchildren of butterflies that made the same trip the previous year travel.
Without any landmarks to guide them, they make this journey over thousands of miles solely by instinct. Scientists believe the butterflies are guided by celestial navigation and magnetic fields. By mid-November, the majority have arrived and the colony may number more than 100 million butterflies in an area 10 to 20 acres in size. It is estimated that more than a dozen colonies form each winter in this one remote region. |
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