Fireflies prefer to live in wet and humid areas.
Not all fireflies glow, but most of their larvae do.
Fireflies use their "glow" to communicate and find mates.
Fireflies are not flies, they are beetles.
Firefly larvae eat worms, slugs and snails. Adult fireflies eat nectar and pollen, if they bother to eat at all.
Some species of fireflies can grow to be as big as the palm of your hand.
Some species of fireflies from Russia and Japan lay their eggs in the water. The larvae develop gills to live under the water until they are ready to live on land.