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  5. Monarch butterflies wintering in Michoacán, Mexico
arrow_back_ios arrow_forward_ios Monarch butterflies wintering in Michoacán, Mexico

November 25, 2019

Monarch butterflies wintering in Michoacán, Mexico

© Sylvain Cordier/Getty Image

The migrating monarchs of Michoacán

Probably the most recognizable of all the butterfly species, monarchs are helpful pollinators that can be found across the United States and Canada in the summer. But each fall, millions of these orange and black beauties embark upon one of the world's most amazing migrations. The insects make use of air currents to make the long journey south to the mountains of southwestern Mexico, a flight of up to 3,000 miles. Aside from being a staggeringly great distance for these delicate insects to fly, it's also a journey to a place that not one of them has ever been to before. And unlike the many bird species that undertake annual round-trip migrations, these butterflies will never return to the north. Why not? Because the distance and length of the total annual migration cycle is greater than the lifespan of individual monarchs.

The monarchs travel here to the mountains of Michoacán, Mexico, in search of a safe, warm place to spend the winter. They huddle together on trees known as sacred firs, which create an optimal microclimate that ensures the temperatures don’t go too high or low. The butterflies will stay here through the winter before starting the cycle all over again in March, when they begin to fly back north. After a relatively short distance, these monarchs will stop to mate and lay eggs on milkweed plants. The eggs will hatch after just a few days, eventually transforming into the next generation of adult butterflies to continue the trek back north. The annual cycle takes four or five generations of monarchs to complete, so the butterflies are following in the path most recently traveled by their great-grandparents (or so).

How do they know where to go if they've never been where they're going? Scientists aren't exactly sure, but they think monarchs use the sun as a compass and are compelled to migrate to follow the flowering path of their food source, milkweed.

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