In 1975, hundreds of millions of Monarch butterflies were discovered in Mexico's Transvolcanic Mountain Range. Most of them had traveled more than 1000 miles to a secluded patch of forest where the conditions are right to survive the winter, then travel north in the spring to begin a new... Show More >>
In 1975, hundreds of millions of Monarch butterflies were discovered in Mexico's Transvolcanic Mountain Range. Most of them had traveled more than 1000 miles to a secluded patch of forest where the conditions are right to survive the winter, then travel north in the spring to begin a new generation.
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