One of the world's two largest butterfly data bases showing disturbing trend of reduced butterfly populations.
The number of butterflies migrating through the state has fallen to a nearly 40-year low as populations already hurt by habitat loss and climate change encountered a cold, wet spring, researchers said.
"Some of them were already in decline, but this weather really added insult to injury, kicking them when they were down," said Arthur Shapiro, an entomologist with the University of California, Davis.
Read more about what species are disappearing and why.
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