monarchs in Mexico

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Madeline

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Nov 11, 2025, 7:57:26 PM (2 days ago) Nov 11

to MassLep

There's a facebook site in Mexico that reports on the migration.

If you're nervous about going to the facebook site, below the link are excerpts:

From: https://www.facebook.com/correorealmx

Warren Shanti & Hangala

THE MONARCHS HAVE ARRIVED TO THEIR HIBERNATION SANCTUARY IN MEXICO!

At 15:42 hours this Thursday, November 06, the first official sighting of Monarch butterflies was registered in the place known as Los Letreros, Sierra Campanario, within the Monarch Butterfly Biosphere Reserve, in the El Rosario Sanctuary, Ocampo municipality, Michoacán.

The information was shared by Juan Gomez, who reported the arrival of the first Monarchs to the sanctuary, marking the beginning of the hibernation season 2025-2026.

The official opening of sanctuaries in Mexico is scheduled for November 21, 2025.

Although the first butterflies have already reached their destination, the migration is still continuing along the migratory route.

We invite everyone to look up into the sky, visit parks and gardens, and stay tuned to record and report their Monarch butterfly sightings.

Each observation contributes to better understanding of their journey and strengthening conservation actions.

Welcome, Monarchs!

500 MONARCH BUTTERFLIES FLY TO MEXICO WITH TRANSMITTERS GLUED TO THEIR BODIES

For the first time in history, 500 Monarch butterflies travel on their annual migration from Canada and the United States to the oyamel forests of the State of Mexico and Michoacan with a light transmitter attached to their chest, which weighs only 60 milligrams, the same as a grain of rice.

The “Monarch Collaboration Project,” led by David La Puma, former director of the Cape May Bird Observatory in New Jersey and current leader of Global Markets Development for Cellular Tracking Technologies (CTT), aims to study the Monarch Butterfly migration with an unprecedented level of detail.

Transmitters, between five and eight centimetres in length, operate on solar and Bluetooth, making it easier to detect the Monarch Butterfly through new technologies, as well as existing networks such as Motus towers and Terra stations.

According to Rocío Treviño, coordinator of the Royal Mail Program, dedicated to following the migration of the Monarch Butterfly, a couple of weeks ago it crossed to Mexico through the border of Coahuila, the first female with a satellite transmitter.

After 37 days and 2,362 kilometers traveled, the specimen named LPM021 arrived in our country after being released last September 13 at Long Point, Ontario, Canada.

The Monarch Butterfly was spotted on October 19 at 16:53 p.m., near La Presa de la Mistad in Ciudad Acuña, Coahuila.

"It's interesting the system they're using right now, it's not common yet, it's still expensive, but this year they're going to see if it works," Rocío Treviño commented.

According to the Cellular Tracking Technologies portal, each 2.4 Gigahertz (GHz) ultralight radio label for the Monarch Butterfly costs $175, plus the data plan it must have to transmit in real-time.

Through the Monarch Proyect App downloaded for free on the mobile phone, anyone can participate in this project that allows the collection of important data about the migration of the Monarch Butterfly to hibernation sanctuaries in Mexico.