Once a year they come out, by the thousands. Fireflies. But these aren’t just any fireflies. These are Photinus Carolinas, also known as synchronous fireflies They blink on and off together. It’s an amazing site. On this episode, I head to Great Smoky Mountains National Park to experience the synchronous fireflies and learn how light from human development is threatening the future of these delicate, glowing insects and what the park is doing to try to protect them. This show would not be possible without listener support. You can help us continue to create this special immersive storytelling by donating at kuow.org/donate/thewild. Thank you. For some great photographs and clips from our journey through the national parks, check out our Instagram @thewildpod and @chrismorganwildlife. THE WILD is a production of KUOW, Chris Morgan Wildlife, and the NPR Network. This episode was produced by Matt Martin and edited by Jim Gates. THE WILD is hosted, produced and written by Chris Morgan. Fact checking by Apryle Craig. Our theme music is by Michael Parker.   See omnystudio.com/listener for privacy information.