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U.S. Fish and Wildlife Service via Flickr under CC BY 2.0 Butterfly populations in the United States have dropped by almost a quarter in the last two decades, according to a new analysis published ...

The findings revealed that 33% of butterfly species have experienced significant population declines over the past two decades, with 107 out of the 342 species examined losing more than half of ...

Still, researchers didn’t have enough data to include some of the most imperiled butterfly species, which probably experienced some of the steepest declines. And the data was quite likely biased ...