Photinus carolinus, commonly known as the Smokies synchronous firefly, is a species of rover firefly whose mating displays of synchronous flashing have fascinated both scientists and tourists. As individual females synchronize with males nearby, waves of alternating bright light and darkness seem to travel across the landscape. Firefly displays typically occur in early June near Elkmont, Tennessee, in the Great Smoky Mountains National Park, near Gatlinburg. The species can be found in isolated pockets of the Appalachian Mountains in the eastern United States.

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