(also known as fireflies)
WHY DO LIGHTNING BUGS FLASH?
The main reason Lightning Bugs flash is to attract mates. Among most but not all species of North American Lightning Bugs, males fly about flashing while females perch on vegetation, usually near the ground. If the female sees a flasher and she's ready to mate she responds by flashing right after the male's last flash. A short flash dialogue takes place as the male flies closer and closer, and then, if all goes well, they mate.
Each Lightning Bug species has its own special flash pattern, so flashers don't attract a species of firefly different from their own. Flash patterns range from continuous glows or single flashes, to series of multi-pulsed flashes.
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. If you see only a glow on the ground, it can be tricky deciding whether you're seeing a firefly larva, a glow-worm, or some other luminescent arthropod.
A study at Cornell University found that sometimes females of the genus Photuris flash signals that attract male fireflies of another species. When a male arrives to mate, the female Photuris eats him.
To learn more about how Lightning Bugs make their light, visit the Bioluminescence Web Site.
WHAT DO LIGHTNING BUGS EAT?
Lightning Bug larvae live on the ground, under bark, and in moist swampy places. They eat earthworms, snails and slugs, plus they may scavenge certain small dead animals and other organic material . They have been seen following slime trails to their slug and snail victims. Lightning Bug larvae, one of which is shown at the right, have sickle-shaped mandibles with which they can inject a kind of chemical that paralyzes their prey and helps digest it. Several larvae have been seen cooperating during attacks on prey.
Adult Lightning Bugs, who can live for several months, probably feed on plant nectar. A few adult Lightning Bug species practice an especially tricky kind of cannibalism. Already-mated females emit flashes similar to the female responses to male Lightning Bugs of other species. When the male of the other species lands, the female emitting the false flashes pounces on the poor male and eats him!
Lightning Bugs are the same as Fireflies. They are members of a particular family of the Beetle Order. The Firefly Family is technically known as the Lampyridae.
Lightning Bugs are beetles. They can't be "flies" as their name suggests because "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.
DISAPPEARING LIGHTNING BUGS
Naturalist Jim remembers that when he was a child back in the 1950s the landscape at dusk was much more populated with lightning bugs than nowadays. It's easy to explain why. Lightning bugs live in fields, meadows, forests, and other natural habitats that are disappearing. Also, people use a lot of pesticides that are as likely to kill lightning bugs as the creatures they are supposed to kill, like mosquitoes.
If you want to help fireflies, then don't be responsible for the disappearance of more fields, meadows, and forests (don't waste products made of natural resources), and cut down on pesticide use. For example, use insect repellent instead of fogging the landscape with chemicals for killing mosquitoes. Other common-sense ways to help are detailed at the Firefly.Org website.
You might enjoy reading the Lightning Bug page of my short online book Walks With Red Dog.
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Conrad, Jim. Last updated . Page title: . Retrieved from The Backyard Nature Website at .