The studies, reported by the World Wildlife Fund and the Xerces Society, report both encouraging and discouraging news on butterfly populations.
Eastern monarch butterfly population nearly doubles in 2025 The World Wildlife Fund reports on the eastern monarch butterfly population nearly doubled in 2025, according to a new report announced in Mexico.
Study Finds That US Butterfly Populations Are Severely Declining The Xerces Society reports on a new study that found that populations of butterflies across the United States are declining. In addition to dramatic declines for individual species, the study concluded that total abundance of butterflies has declined by 22% from 2000 to 2020.