Why do fireflies glow? It's more than butt goo.

These luminous beetles use light to flirt and fend off predators. More information Adding us as a Preferred Source in Google by using this link indicates that you would like to see more of our content in Google News results. Breakthroughs, discoveries, and DIY tips sent six days a week. By signing up, you confirm you are 16+, will receive newsletters and promotional content and agree to our Terms of Use and acknowledge the data practices in our Privacy Policy . Growing up, Clyde Sorenson loved catching bugs, especially fireflies.