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Fireflies are lighting up summer skies. But the glowing bugs are still on the decline

U.S. NORTHEAST, JUL 31 – Firefly populations in the U.S. Northeast continue to decline due to habitat loss, pesticides, and light pollution despite bright summer displays, experts say.

  • In 2024, fireflies illuminated nights throughout the northeastern United States during the summer, including a July 8 sighting at Tremper Mound in Ohio.
  • Experts believe that the unusually wet spring promoted favorable circumstances that helped immature fireflies develop fully into adults.
  • Despite their bright displays, firefly numbers continue to fall, primarily due to the destruction of their natural environments, widespread chemical treatments, and increased artificial lighting.
  • Entomologist Jessica Ware emphasized the need for humans to adjust their behavior to help maintain healthy and thriving firefly populations.
  • The decline suggests ongoing environmental threats, highlighting the need for conservation to preserve fireflies as a part of summer's natural heritage.
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Fireflies are lighting up summer skies. But the glowing bugs are still on the decline

Fireflies are lighting up summer evenings across the U.S. Northeast, putting on dazzling shows in backyards and city parks.

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The Hamilton Spectator broke the news in Hamilton, Canada on Thursday, July 31, 2025.
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