The Fire Fly or Lightning Bug is a species of beetle that live in warm climates. They produce a natural glow that is found in the adults and larva stage. Fire flies are commonly thought as to be flies, but they are not flies, but beetles. They are carnivores and eat smaller insects. You can see fireflies during the summer when it is hot. The female and male use flashes to signal each other. The flashes are different between the sexes.