If you ever have an opportunity to get to the Smoky Mountains in early June, be sure to get out at night and watch the fireflies flash all at once. This year they’ll be doing it between June 5-13.
The last time we were there, we saw them do this quite by accident. We were just standing out on our balcony one night and noticed something odd. “Hey, what’s the deal with the lightning bugs?” They were flashing in patterns, and it wasn’t completely obvious at first, but then it became noticeable. Pretty cool.
Here’s a video for you. Hard to photograph fireflies flashing, but whoever did this one did a pretty fair job of it.
No one knows for sure why they do it, but they’re only known to do it at this one place. Maybe they like to put on a show for all the visitors. Smoky Mountain National Park is the most visited park in the country. http://www.nps.gov/grsm/naturescience/fireflies.htm