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California's monarch population has declined sharply from 4.5 million in the 1980s. The population initially dropped to nearly 200,000 and had an even greater decrease during 2018. That year, the population fell to nearly 30,000. By November 2020, the population had dropped to fewer than 2,000, representing a 99% collapse in three decades. [46]
But in 2018, the population plummeted to just about 28,000 monarchs. The monarch butterfly overwintering population hit an all-time low in 2020, with fewer than 2,000 counted across all of California.
Southward migrating monarchs resting on a pine tree in Fire Island National Seashore on Long Island, New York (September 2021). Although the exact dates change each year, by the end of October, the population of monarchs east of the Rocky Mountains migrates to the sanctuaries of the Mariposa Monarca Biosphere Reserve within the Trans-Mexican Volcanic Belt pine-oak forests in the Mexican states ...
Coverage declined to its lowest point to date (0.67 hectares (1.66 acres)) during the winter of 2013–2014, but rebounded to 4.01 hectares (10 acres) in 2015–2016. The average population of monarchs in 2016 was estimated at 200 million. Historically, on average there are 300 million monarchs. The 2016 increase was attributed to favorable ...
An annual winter count by the Xerces Society recorded fewer than 2,000 butterflies, a massive decline from the tens of thousands tallied in recent years and the millions that clustered in trees ...
In 2017, the U.S. Geological Service reported that as many as 1.8 billion additional milkweed stems would be needed in North America to restore the monarch butterfly population. It takes about 28. ...
Monarch Watch. Monarch Watch is a volunteer-based citizen science organization that tracks the fall migration of the monarch butterfly. [1] It is self-described as "a nonprofit education, conservation, and research program based at the University of Kansas that focuses on the monarch butterfly, its habitat, and its spectacular fall migration."
Monarch butterflies fly through the County Grounds in Wauwatosa on Wednesday, June 9, 2021. The monarch butterfly population in the United States has declined by more than 80% in the last 20 years.