Dozens of Butterfly Species on ‘Precipitous Decline’ in the Midwest U.S., Study Finds

Dozens of Butterfly Species Disappearing from the Midwest U.S., Study Finds

A recent study conducted by Michigan State University has revealed a worrying trend of disappearing butterfly species in the Midwest region of the United States. The comprehensive study examined 136 different butterfly species and found a disturbing pattern of decline in their populations over the past two decades.

Lead author of the study, Wendy Leuenberger, expressed surprise at the results, stating, “We expected to find that at least some species had done well over the past 32 years.” However, the researchers were dismayed to discover that all observed butterfly populations had either decreased or remained stagnant during the study period.

While the decline in butterfly populations has been observed across the entire United States, the Midwest region has experienced a particularly steep drop in numbers. Popular species like the iconic monarch butterflies are reported to be significantly less prevalent in the Midwest, with rare species also becoming harder to spot.

Leuenberger noted that these declines have taken place within a single generation, underscoring the rapid nature of the loss. The study did not provide a definitive explanation for the dwindling populations, but there is a suspected link to the increased use of “neonicotinoids” insecticides, as reported by USA Today.

In a bid to raise awareness about the issue, the findings of the study were published in the peer-reviewed journal Proceedings of the National Academy of Sciences. The research underscores the urgent need for conservation efforts to protect these vital pollinators and their fragile ecosystems.

Besides butterflies, other insect populations are also under threat, with reports of declining honeybee numbers. According to the University of California Agriculture and Natural Resources, over 60% of commercial honey bee colonies perished between June 2024 and January 2025, marking the largest decline recorded since 2010.

Researchers have highlighted various potential factors contributing to the decline in bee populations, including miticide-resistant varroa mites, climate change, pesticide exposure, and habitat loss. These alarming trends are a stark reminder of the interconnectedness of all species in the ecosystem and the urgent need for conservation action.

Conservationists and scientists are calling for immediate measures to address the decline of insect populations and safeguard biodiversity. Efforts to reduce the use of harmful pesticides, preserve natural habitats, and promote pollinator-friendly practices are crucial steps towards ensuring the survival of vital insect species in the Midwest and beyond.

The study’s revelations serve as a poignant reminder of the ecological challenges facing our planet and the pressing need for sustainable conservation practices to protect biodiversity and the delicate balance of nature. As we confront these alarming trends, it is imperative that we take collective action to preserve the rich tapestry of life that butterflies and other pollinators contribute to our world.