Monarch Butterfly Population Sees Significant Increase in Mexico

The population of monarch butterflies in Mexico has experienced a notable increase of 64% this winter compared to the previous year, according to figures released by the World Wildlife Fund (WWF) Mexico. The area occupied by these butterflies expanded to 2.93 hectares (7.24 acres) of forest, marking the largest coverage since 2018. This resurgence offers a glimmer of hope for a species that has faced significant threats, including habitat loss, climate change, and pesticide use.

The Guardian

Mexican Environment Minister Alicia Bárcena Ibarra emphasized the importance of the monarch butterfly, stating, “The monarch butterfly is the symbol of the trilateral relationship between Mexico, the United States and Canada. Its conservation is a collective commitment we must maintain for the future.” Each fall, millions of monarchs travel nearly 3,000 miles from Canada through the United States to their wintering grounds in western Mexico, where they create a stunning visual display.

The Guardian

Despite the recent increase, the monarch butterfly population remains at risk due to several factors. Habitat loss from deforestation, particularly in the state of Michoacán, has been exacerbated by illegal logging linked to organized crime and the expansion of avocado farming. The area covered by monarchs has drastically decreased from a peak of nearly 18.21 hectares (45 acres) in 1995 to well below the 6.07 hectares (15 acres) deemed necessary for their survival.

The Guardian

In the United States, the use of herbicides such as glyphosate and dicamba has led to a significant decline in milkweed, the sole food source for monarch caterpillars. This decline prompted the Biden administration to propose listing the monarch as threatened under the Endangered Species Act by the end of 2024; however, this decision has been delayed indefinitely by the Trump administration.

The Guardian

Despite these challenges, conservation efforts have made strides in protecting the monarch's habitat. Logging in the core zone of the Monarch Butterfly Biosphere Reserve has been virtually eradicated since 2008, with only 2.55 hectares (6.3 acres) affected between February 2024 and February 2025. María José Villanueva, director of WWF Mexico, noted, “One of the greatest achievements of this work is that illegal logging in the core zone has been virtually eradicated.”

The Guardian

Environmental groups have expressed concern over the lack of timely protections for the monarch butterfly. In February, two organizations filed a lawsuit to compel the Trump administration to set a date for implementing protections. Tierra Curry, co-director at the Center for Biological Diversity, criticized the delay, stating, “It would be unforgivable for [the monarch’s] epic migrations to collapse because of political cowardice on enacting range-wide protections for them.”

The Guardian

While the increase in the monarch butterfly population in Mexico is a positive development, significant threats remain. Continued conservation efforts and political action are essential to ensure the survival of this iconic species, which plays a vital role in the ecological and cultural landscapes of North America.

The Guardian