Monarch butterfly populations in Mexico dive to near-record low

Monarch butterfly populations in Mexico dive to near-record low

/ 07:35 AM February 09, 2024
Monarch butterfly numbers in Mexico plummet to near record low
FILE PHOTO: A monarch butterfly rests on a flower at the Sierra Chincua butterfly sanctuary in Angangeo, Michoacan state, Mexico on December 6, 2023. REUTERS/Raquel Cunha/File Photo

MEXICO CITY — The population of monarch butterflies in the Mexican forests where they spend the winter fell to the second-lowest figure on record this season, offering a grim snapshot of the already endangered orange-and-black insects.

The iconic butterflies’ presence was only documented in 2.2 acres (0.9 hectares) of forest spanning a couple of Mexican states where they traditionally hunker down for the winter, according to the latest annual study published on Wednesday and conducted by Mexico’s protected natural areas commission and the Swiss-based World Wildlife Fund (WWF), an environmental group.

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.


READ: Endangered monarch butterflies face perilous storm


The 2023-2024 winter figure marks the second-lowest since the population survey began over three decades ago, and is down nearly 60% from just the previous winter.

Biologists pin the blame for the nosedive on higher-than-usual temperatures and drought conditions where the butterfly reproduces, mostly in northwestern US states like Washington, Oregon, and California.

READ: In Mexico, endangered monarch butterflies inspire hopes of a comeback

The adverse weather, made worse by climate change, translates into less milkweed, the plant where the butterflies mostly lay their eggs and what their caterpillar offspring feed on.

In one of the planet’s epic wildlife migrations, the fluttering butterflies travel south as many as 2,800 miles (4,500 km) from spots as far north as Canada to eventually spend the winter in warmer Mexico, where millions cling to trees that protect them from the rain and chill.

READ: Monarch butterflies drop ominously in Mexico


Monarch butterfly populations fluctuate year to year, and as recently as 2021, the same survey showed a 35% uptick to cover around 7 acres.

Officials and activists called for more action to boost the species, including the need to confront threats posed by herbicides that decimate milkweed plus forest conservation.

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“We can’t lower our guard,” Jorge Rickards, head of WWF’s Mexico office, told reporters after releasing the latest data.

TOPICS: butterfly, Climate change, endangered species, insect, Mexico, Weather
TAGS: butterfly, Climate change, endangered species, insect, Mexico, Weather

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