Phenomenal Fireflies - Alex Wild Photography
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A male big dipper firefly, Photinus pyralis, signals to females with an illuminated upward swoop. 

Urbana, Illinois, USA

A male big dipper firefly, Photinus pyralis, signals to females with an illuminated upward swoop. Urbana, Illinois, USA

Photinus pyralisfireflyfirefliesbioluminescenceflightinsect flyingLampyridaewings