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With 86% Drop, California's Monarch Butterfly Population Hits Record Low

Jan 10, 2019 - The New York Times

They arrive in California each winter, an undulating ribbon of orange and black. There, migrating western monarch butterflies nestle among the state's coastal forests, traveling from as far away as Idaho and Utah only to return home in the spring.

This year, though, the monarchs' flight seems more perilous than ever. The Xerces Society for Invertebrate Conservation, a nonprofit group that conducts a yearly census of the western monarch, said the population reached historic lows in 2018, an...