Why do lightning bugs flash?

Among some species both males and females flash, but among others only the members of one sex do it. Some Lightning Bug species don't flash at all. All known firefly larvae, which are wingless and mostly live on the ground and under bark, produce light. read more

Lightning Bugs are beetles. They can't be "flies" as their name suggests, since "flies" are members of the Fly Order. Glow-worms, which produce light similar to Lightning Bugs', also are beetles, but they belong to a different, though closely related, family, the Phengodidae. There are many Lightning Bug species. read more

Like all other beetles, lightning bugs have hardened forewings called elytra, which meet in a straight line down the back when at rest. In flight, fireflies hold the elytra out for balance, and rely on their membranous hindwings for movement. read more