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Monarchs slow-dance to Mexico as numbers dwindle

By David Pendered

Dec. 2 – Monarch butterflies are slow to arrive at their winter homes in Mexico, and Georgia is asking citizens to count the butterflies they see perched in the Peach State.

The ask comes as federal officials are to announce this month their decision on whether the monarch should be listed as an endangered or threatened species. The population has been declining for 30 years. Reasons include loss of habitat to urban development, as the US Fish and Wildlife Service reported in 2020.

Monarch butterflies migrate from North America to their wintering grounds located around the capital city, Mexico. (Credit: Journey North, David Pendered)
Monarch butterflies migrate from North America to their wintering grounds located around the capital city, Mexico. (Credit: Journey North, David Pendered)

The slow arrival of monarchs in Mexico has affected their formation of colonies in trees west of the capital city, Mexico, Journey North reported Nov. 27. Late November has been the traditional arrival time of arrival for monarchs at their winter homes in central Mexico.

At sanctuaries in Sierra Chincua and El Rosario, guides and government officials are guarding from visitors the butterflies that have landed. Visitors are asked to keep a greater distance from the landing sites and guide ropes are being moved farther from the sites, according to a report by Journey North writer Estela Romero.

In Georgia, the state Department of Natural Resources is asking for volunteers to help chronicle – and report via two web portals – the monarchs who spend the winter in Georgia, as well as across the South in the Carolinas, Florida, Alabama, Mississippi, Louisiana and Texas.

DNR described the important role of citizen scientists in tracking monarchs. Their findings have helped scientists understand how and why “some monarchs breed throughout the winter in the southern U.S. Scattered reports suggest that some monarchs can overwinter in coastal regions in a non-breeding state, similar to their wintering behavior in Mexico.”

Here’s information on how to submit information about monarchs in the winter:

At https://journeynorth.org/reg

  • Create a free account
  • Learn how to report monarch sightings (https://journeynorth.org/monarchs)
    November-March, submit monarch observations at https://journeynorth.org/sightings

At https://www.inaturalist.org

  • Create a free account
  • November-March, submit report monarch observations using your web browser or phone app
Monarchs rest on an oyamel fir tree after their trek to their winter home in the mountains of central Mexico. (File, 2021. Mark Garland via Cape May Bird Observatory)