The eastern monarch butterfly — one of nature’s most celebrated migrants — is showing signs of recovery. A new survey finds that monarchs wintering in Mexico’s central highlands occupied 4.42 acres of forest this past season, nearly double the 2.22 acres recorded the winter before. The rebound follows years of coordinated conservation work across three countries and offers cautious encouragement for a species still fighting for its survival.
At a glance
- Monarch butterfly population: Migratory eastern monarchs covered 4.42 acres of Mexican highland forest this winter, up from 2.22 acres the previous season — nearly a 100% increase in occupied habitat.
- Migration route conditions: Scientists point to milder drought conditions along the butterflies’ North American flyway in 2024 as a likely driver of the rebound, giving more monarchs the resources to complete the journey.
- Endangered species status: In December 2024 C.E., the U.S. Fish and Wildlife Service proposed listing monarch butterflies as threatened under the Endangered Species Act, following years of advocacy by conservation groups.
What the survey found
The annual Forest Area Occupied by Monarch Butterfly Colonies in Mexico During the 2024–2025 Hibernation Season survey is produced by WWF Mexico and Mexico’s National Commission of Protected Natural Areas, in collaboration with local communities. It measures the acreage of high-elevation fir trees blanketed in clusters of overwintering butterflies — a reliable proxy for overall population health.
This year’s figure of 4.42 acres represents meaningful progress. But scientists and conservationists are careful not to overstate it. The long-term average for the species is significantly higher, meaning the population is still well below where it needs to be for recovery to be considered secure.
Why the monarch matters
Each fall, eastern monarchs make one of the most remarkable journeys in the animal kingdom. Millions of butterflies travel up to 3,000 miles from breeding grounds in southern Canada and the northern U.S. to a cluster of mountainous forests in the Mexican states of Michoacán and Mexico State. No individual butterfly makes the round trip more than once — yet generation after generation finds its way back to the same groves of oyamel fir trees.
The species plays a real ecological role as a pollinator, supporting the wildflowers and plants it feeds on along its migration corridor. It also holds deep cultural significance for Indigenous communities in Mexico, where the butterflies’ annual return has long been tied to the memory of ancestors.
Habitat loss on both ends of the migration — from milkweed decline in the U.S. and Canada, and illegal logging in Mexican forests — combined with climate-driven drought has driven the population down sharply over recent decades. A separate study found the U.S. monarch population shrank by 22% over the past two decades.
Community and cross-border conservation
Jorge Rickards, director general of WWF Mexico, credited local communities in the forested highlands as essential to any progress the species has made. Indigenous and rural communities in the Monarch Butterfly Biosphere Reserve — a UNESCO World Heritage site — have participated in habitat monitoring, anti-logging patrols, and ecotourism initiatives that give them a direct economic stake in the butterflies’ survival.
“It’s now time to turn this year’s increase into a lasting trend with an all-hands approach where governments, landowners, conservationists, and citizens continue to safeguard critical habitats along the monarch’s North American migratory route,” Rickards said in a statement.
That cross-border thinking is increasingly central to monarch recovery efforts. Conservation groups in the U.S. have pushed for more milkweed planting along agricultural corridors, while federal protection proposals in the U.S. aim to regulate activities that degrade key breeding habitat. In Canada, federal conservation strategies focus on restoring prairie and meadow habitats where monarchs feed and breed on their northward journey.
A real gain, with real limits
Scientists believe that 2024 C.E.’s more favorable weather — particularly reduced drought severity along the migration corridor — helped more butterflies complete their journey in better condition. That’s an encouraging sign, but it also underscores how vulnerable the species remains to year-to-year climate variability.
One unresolved challenge is milkweed availability. Monarchs can only reproduce on milkweed, and large-scale agricultural land use has dramatically reduced it across the American Midwest. Without sustained milkweed restoration at scale, favorable weather in any single year may not translate into a durable population trend.
Still, doubling the area of occupied forest in a single year is not a small thing. It signals that the conditions for recovery exist — and that the conservation infrastructure built over decades across three countries can produce results when conditions align. The question now is whether those gains can be locked in.
Read more
For more on this story, see: The Guardian
For more from Good News for Humankind, see:
- Ghana protects a critical stretch of Atlantic coastline
- Renewables now make up nearly half of global power capacity
- The Good News for Humankind archive on wildlife conservation
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