Fireflies produce light to attract mates, with different species displaying varying light patterns and colors.
Certain species of beetles, such as the Lampyridae family, also glow in the dark, producing light for mating or communication purposes.
The larvae of some fungus gnat species glow in the dark, often to attract potential mates or prey.
Some species of click beetles have the ability to emit light, though they do so less frequently than fireflies.