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I did not run this photo with my other Tennessee vacation pictures because it is not an actual photo, but is instead a collage of images of the night. The creek and the fireflies pictured are all at Elkmont on the night we were but I layered individual firefly shots over a twilight shot of the creek to recreate the actual scene as we saw remembered it between 9:30 and 10:30 the night we were there.
I knew from quite a bit of Internet research in advance that the fireflies were EXTREMELY difficult to shoot. While very bright to the human eye they are not very bright to a cameras sensor!
More on this event @ http://www.appvoices.org/index.php?/site/voice_stories/the_synchronous_fireflies_of_elkmont/issue/528