After flying some 3,000 miles from the northern U.S. and Canada to a remote forest in Central Mexico for the winter, tens of millions of monarch butterflies are making their way back north. These are ...

Monarch butterflies showed mixed overwintering trends across North America in 2025, with gains in Mexico and declines at several California sites. In December 2025, colonies in Mexico’s Monarch ...

Observers in Oklahoma have spotted small groups of monarch butterflies roosting on their way south. Millions of monarchs make the journey each year.

MEXICO CITY (AP) — The number of monarch butterflies wintering in the mountains west of Mexico City rebounded this year, doubling the area they covered in 2024 despite the stresses of climate change ...

Monarch butterflies are at the beginning of an incredibly long migration south to overwinter. Here's where Michigan's ...

PIEDRA HERRADA, Mexico -- More Monarch butterflies appear to have made the long flight from the U.S. and Canada to their winter nesting ground in western Mexico, raising hopes after their number ...

MEXICO CITY (CN) — The yearly migration of monarch butterflies might best be described as a round-trip relay race. Multiple generations of butterflies are born, reproduce and die along the journey.

Absence of large-scale illegal logging and fewer extreme weather events contributed to the decline. Deforestation in the core zone of the Monarch Butterfly Biosphere Reserve in Mexico decreased by ...

MEXICO CITY -- The number of monarch butterflies wintering in the mountains west of Mexico City rebounded this year, doubling the area they covered in 2024 despite the stresses of climate change and ...