What bugs eyes light up at night?

Many species of fireflies, also known as lightning bugs, light up at night using bioluminescence. This phenomenon is primarily used for communication, especially during mating rituals. Other insects, like certain types of beetles and some species of moths, can also emit light, but fireflies are the most well-known for their nighttime glow. Their light is produced through a chemical reaction in their bodies involving luciferin and luciferase.