For thousands of years, millions of monarch butterflies have migrated from the northern U.S. and Canada to Mexico for the winter. But exactly how they know where to go is still a mystery.

Monarchs traveled to a remote part of Mexico, a journey they've made for thousands of years, and wintered there. Now tens of millions of the butterflies are on an epic aerial journey back north.

Commissioner Sid Miller, Department of Agriculture report double increase in Mexico monarch butterfly population after 2024 ...

The Xerces Society for Invertebrate Conservation says, along the California coast, 4.5 million monarchs overwintered in the ...

SALT LAKE CITY — The U.S. Fish and Wildlife Service said it is reopening the public comment period for a proposed rule to list the monarch butterfly as a threatened species under the Endangered ...

Hummingbirds aren't the only spring-time animals on the move across Georgia. Sightings of monarch butterflies have been seen predominantly near southern cities like Savannah and St. Mary's ...

The monarch butterfly population has declined in recent decades, leading to a proposed listing as threatened under the Endangered Species Act. People can help monarch butterflies by planting ...

In a turn of events, the eastern monarch butterfly population — which was put on the list of endangered species just a few years ago — nearly doubled this year, according to a March report ...

At the same time, the population of western monarch butterflies has also seen a decline. The Xerces Society for Invertebrate Conservation monitors this population and reported the lowest count ...

A study compiled data from more than 76,000 butterfly surveys across the continental U.S. The declines seen in the last 20 years alarmed researchers.