In encouraging news, the eastern monarch butterfly population nearly doubled in 2025, according to a new report announced in Mexico. The population wintering in central Mexico's forests occupied 4.42 ...

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 first countrywide systematic analysis of butterfly abundance found that the ... counted a nearly all-time low of fewer than 10,000, down from 1.2 million in 1997. David Wagner, a University ...

Butterfly populations have dropped by 22% across ... This year, monarchs covered 4.42 acres, up from 2.22 acres the year before, the survey said. This increase in monarchs is directly related ...

Ultimately, the butterfly decline is part of a larger global trend of insect population loss, with insects declining by about 1-2% annually, the study's authors said. Butterflies play an essential ...

US butterfly populations have declined by 22% since 2000, with 114 species showing significant drops. A study published in Science found insecticides, climate change, and habitat loss are driving ...

We found declines in just about every region of the continental U.S. and across almost all butterfly species. Overall, nearly one-third of the 342 butterfly species we were able to study declined ...

Over the past 20 years the U.S. butterfly population has declined 22%, a dramatic loss that has scientists concerned. "The easy number to think about is the total number of butterflies in your yard.

A fluttering butterfly makes most people smile with delight ... says author Earth losing roughly 1% to 2% of its insects annually, new studies suggest As caterpillars, butterflies transfer ...

Researchers compiled data on more than five hundred butterfly species across the United States from 2000 to 2020. Some species are faring better than others, but overall, butterfly numbers dropped ...

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 ...