How and why do fireflies light up?

Fireflies light up the backyard and keep gardens healthy

How To Make Fireflies That Really Light Up

All About Fireflies

Scientific Information - Fireflies

Why Do Fireflies Glow?

How fireflies glow — and what signals they're sending

Bugs that Light Up the Sky – Maggie's Farm Ltd

Fireflies

Why do lightning bugs still make light after you squish them? - Quora