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The Western population of the monarch butterfly has declined to a near-record low with fewer than 10,000 found living in California this winter, a foreboding sign for the future of the beloved ...
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]
The number of monarch butterflies in California is in sharp decline this year. This is the second-lowest population recording since tracking began in 1997. Biologists say record-high late summer ...
Monarch populations in the West face an even greater chance of extinction at 99% by the year 2080. The Fish and Wildlife Service is accepting public comments on its proposal until March 12, 2025.
According to the Xerces Society, the monarch population in California decreased by 86% in 2018, going from millions to tens of thousands of butterflies. [166] The society's annual 2020–2021 winter count showed a significant decline in the California population. One Pacific Grove site had no monarch butterflies. A primary explanation for this ...
Monarch butterfly migration is the phenomenon, mainly across North America, where the subspecies Danaus plexippus plexippus migrates each autumn to overwintering sites on the West Coast of California or mountainous sites in Central Mexico. Other populations from around the world perform minor migrations or none at all.
The western monarch butterfly population wintering along California's coast remains critically low for the second year in a row, a count by an environmental group released Thursday showed. The ...
The number of western monarch butterflies overwintering in California dropped by 30% last year, likely due to how wet it was, researchers said Tuesday. Volunteers who visited sites in California ...