Every year, one of the most spectacular natural phenomena in Mexico takes place in the forested mountains west of Mexico City. During the fall, colonies of monarch butterflies migrate here from colder northern climates to find warmth and begin their breeding season. These huge flying colonies can contain as many as 20 million monarchs, which make use of air currents to travel as far as 100 nautical miles per day. The monarchs remain in Mexico from around November to March.
Monarch butterflies in Angangueo, Mexico
Today in History
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State funeral of Queen Elizabeth II
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Dancing in The Nutcracker
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Shark Awareness Day
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To the 155th on the 155th
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Blue linckia sea stars in Papua New Guinea
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Antarctica Day
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World Meteorological Day
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Victory Day in Valletta
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Muniellos Nature Reserve
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A treaty for science
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A growing business
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Roman theater of Cartagena, Spain
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Sailing across the ice
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Going head-to-head with winter
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The Grand Départ: Tour de France begins
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Dr. Martin Luther King, Jr. Memorial in Washington, DC
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From Sputnik to extraterrestrial storms
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Boxing Day—a shopper’s delight
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Indian Independence Day
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Let’s talk fossils
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International Day of Color
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Beyond Walls for World Refugee Day
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Keep calm and drive on (slowly)
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Celebrating National Dentist Day
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Lavender fields on the Valensole Plateau in Provence, France
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We have liftoff!
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Leap day
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Big Bend National Park turns 78
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Illuminated Uluru
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Eurasian lynx