Every year millions, if not billions, of monarch butterflies—such as the ones seen above—winter in densely forested mountains 60 miles (100 kilometers) northwest of Mexico City.
"In the spring these butterflies begin an eight-month migration that takes them all the way to Eastern Canada and back, during which time four successive generations are born and die," the World Heritage Committee said in a written statement upon announcing new sites in July 2008.
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