Phenomenal Fireflies - Alex Wild Photography
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The underside of a male firefly, Photinus pyralis, showing the abdomen's massive light-producing segments.

Urbana, Illinois, USA

The underside of a male firefly, Photinus pyralis, showing the abdomen's massive light-producing segments. Urbana, Illinois, USA

Photinus pyralisColeopteraLampyridaefireflyundersidebeetlebioluminescence