How US butterfly populations changed by region, 2000-2020
A review of more than 76,000 surveys from across the contiguous U.S. found butterfly populations fell in almost every region from 2000 to 2020, and in almost every species.
Bars show declines in every region except the Pacific Northwest, which gained 9.9%. The Southwest and Northeast each fell more than 30%. The Midwest dropped 17.2%.
