US researchers release 1,300+ butterflies after just nine were found in 2022

In a summer day in Michigan, researchers released over 1,300 endangered Poweshiek skipperling butterflies, a remarkable increase from just nine found in the wild back in 2022. This species, once feared to be teetering on extinction, has seen a major comeback thanks to the efforts of Michigan State University (MSU) and their conservation partners. The recovery program involved raising the butterflies in captivity, restoring their habitat, and releasing them into the wild.

David Pavlik, a research assistant at MSU's WK Kellogg Biological Station and John Ball Zoo, revealed that 102 butterflies were released in 2022 and more than 1,300 in 2025. The Poweshiek skipperling once thrived across much of the Midwest but its numbers started plummeting rapidly in the early 2000s. By 2022, only nine of these butterflies existed in the entire United States.

This conservation work has had a profound impact on the species, with some butterflies being released to bolster existing populations while others are being used to establish new ones. The success of this effort can be attributed to the re-establishment of prairie habitats, which provide essential resting and feeding grounds for the butterflies. Michigan, with its rare prairie fen wetlands, has become a critical stronghold for these butterflies.

The recovery work is challenging due to the butterfly's short adult lifespan, which lasts for only about two weeks each summer. Researchers must capitalize on this brief window to release and track the butterflies. They employ hoop houses to recreate the hot and humid conditions of Michigan's prairie fens, where the caterpillars are kept and monitored as they develop. Each butterfly is marked with a Sharpie or a small dot of paint to aid in tracking its survival and the spread of populations.

This recovery program has expanded to include two other endangered butterflies, the Mitchell's satyr and Karner blue, as part of the Great Lakes Rare Butterfly Program. These efforts highlight the importance of habitat conservation and the vital role it plays in saving endangered species.