What is a firefly


A glow worm with a glowing abdomen.

Fireflies are insects. They glow in the abdomen and belong to the group of beetles. They are therefore also called fireflies. Most of them can fly. Fireflies can be found all over the world, except in the Arctic. In Europe, fireflies are mostly seen in summer, because that's the time of year they are mostly out and about.

There are fireflies that glow all the time and others that flash their lights. The light from the fireflies can only be seen at night: it is not bright enough to be seen during the day.

The fireflies do not produce the light themselves. In their abdomen there is a chamber with bacteria. These light up under certain conditions. The fireflies are therefore the home of the bacteria. You can switch the bacteria on and off again in a targeted manner.

The fireflies use the light to communicate with each other. Females use the glow to search for a male to mate. Reproduction then goes on as with all beetles: the female lays her eggs in groups. The larvae hatch from this. They later turn into fireflies.

  • ... and all over the world ...