The monarch butterfly populations in western North America have declined dramatically and face a greater risk of extinction, a new study shows.
Scientists at Washington State University found that the decline in western monarch butterfly populations was significantly more than previously believed and greater than eastern monarchs.
“In the 1980s, 10 million monarchs spent the winter in coastal California. Today there are barely 300,000,” said Cheryl Schultz, an associate professor at Washington State University, Vancouver.
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