When living creatures produce and emit light it’s called bioluminescence. The main reason fireflies glow is to find a mate, though they can also light up under other situations as a warning to others.
Science Behind Why Fireflies Glow
How Do Fireflies Glow? Mystery Solved After 60 Years
Why do fireflies shine in the night? - Quora
What makes fireflies glow?
How do fireflies get their glow? We finally have some answers.
About the Book The first-ever comprehensive firefly guide written for all those who want to know more about the amazing world of lightning bugs and
Fireflies, Glow-Worms, and Lightning Bugs - (Wormsloe Foundation Nature Books) by Lynn Frierson Faust (Paperback)
How Do Fireflies Glow?
Blue Sky Science
Blue Sky Science - Morgridge Institute for Research
The Glow
To make better biomedical tools, a grad student picks apart fireflies' glow - STAT
How Do Fireflies Glow? Mystery Solved After 60 Years