On July 21, 2022, the International Union for the Conservation of Nature placed the migratory monarch butterfly on its Red List of threatened species and classified it as endangered. Monarchs migrate ...

Monarch butterflies can fly dozens of miles in a day. They are an astonishing and intrepid species in North America. But in some places, populations of the migratory monarch butterfly, an iconic ...

Monarch butterflies are among the most beloved insects in North America. They are brightly colored and unique, both as caterpillars and later as mature insects. Monarchs are found in every U.S. state ...

About 100 miles northwest of Mexico City in the UNESCO-designated Monarch Butterfly Biosphere Reserve, up to a billion of the brilliant-winged insects spend November to March clustered on branches.

This is an updated version of a story first published on April 20, 2025. The original video can be viewed here. Earlier this year we reported on one of the most remarkable and mysterious migrations in ...

In coming weeks, the Northeast of the United States will experience the peak of its annual migration of monarch butterflies. The butterflies’ life cycle takes place over an astonishingly broad ...