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| The Butterfly Page | |||||||||||||||||||||||||||||
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| Each fall, millions of Monarchs migrate from Canada and the United States to their remote overwintering grounds in the transvolcanic mountains west of Mexico City. Deforestation in Mexico, habitat loss in the United States, changes in agricultural practices, and global warming threaten this phenomenon. | |||||||||||||||||||||||||||||
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| Safe landing | |||||||||||||||||||||||||||||
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