Every year in late June, Peggy Butler and her husband, Ken, welcome visitors to rural northwestern Pennsylvania for the chance to glimpse the rare and beguiling Photinus carolinus. This firefly ...

KELLETTVILLE ― Every year in late June, Peggy Butler and her husband, Ken, welcome visitors to rural northwestern Pennsylvania for the chance to glimpse the rare and beguiling Photinus carolinus. This ...

FOREST COUNTY, Pa. — It all started as these stories sometimes do—by accident. “We didn't know that they were on the property,” said Peggy Butler who, along with her husband Ken, lives on a rural ...

Allegheny National Forest, Pennsylvania This forest glows with both synchronous and common fireflies, reaching peak activity in mid-June. The region also hosts the Pennsylvania Firefly Festival, ...

Launched in 2013, the annual event has become so popular that the Butlers had to institute a lottery system to protect the fireflies that visitors so desperately wanted to see. This year, 2,500 people ...

Where to see fireflies this early summer is drawing attention as nature’s light show returns across the country. This summer’s firefly displays bring out rare syncs and glowing swamps that turn quiet ...