Monarch butterflies gather at their wintering colony in the Monarch Butterfly Biosphere Reserve in Michoacán, Mexico. “So for over a decade now, the colonies haven’t really changed in size.

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During their passage through Mexico, monarch butterflies depend on the shelter of endangered trees—so this scientist is leading a huge experiment to build them a new winter habitat.

Researchers in central Mexico have planted a forest of firs. Now they’re hoping the imperilled Eastern monarch butterflies will come. This population of monarchs, which migrates up to 4,500 ...

Monarch butterflies are returning to gardens across the United States, but a few months ago, I stood in a mountain forest in Mexico where the monarchs spend the winter. They clustered on trees by ...

In one of the planet’s most extraordinary natural spectacles, millions of monarch butterflies (Danaus plexippus) gather every winter amid the fir forests of Central Mexico. They carpet the trees ...

"Several bad years in a row means the demise of a species," Agrawal said. Monarch butterflies rest on a plant in El Rosario Butterfly Sanctuary, in Michoacan State, Mexico on Jan. 31, 2022.

In the mid-1990s, monarch butterflies could be found on around 45 acres of the same forests covered largely by pine and fir trees, along the border between Michoacan and Mexico states. monarch ...

The population of endangered monarch butterflies wintering in Mexico's Michoacan dropped by 22% in just one year.