Why the firefly generate lights at the dark atmosphere.?

Question

Why the firefly generate lights at the dark atmosphere.?

Answer 1

HOW they produce light:

"Luminescence Firefly light, called bioluminescence, is known as "cold light" because it emits almost no heat. Fireflies (or lightning bugs) produce light via a chemical reaction when oxygen, breathed in through their abdominal trachea, combines with a substance called luciferin in the presence of the enzyme luciferase, and ATP (adenosine triphosphate) in special cells called podocytes. When these components are added, light is produced."

WHY they produce it or WHAT IS IT GOOD FOR?

"In most species of North American fireflies, during a certain time of night, males fly about flashing their species specific flash pattern. Females of the same species tend to be perched on vegetation, usually near the ground, and if a flashing male catches a female's fancy, she will respond at a fixed time delay after the last male's flash. A short flash dialogue may ensue between the male and female as the male locates her position and descends to mate (McDermott 1958)."

"All known Firefly larvae have photic organs that produce light. The Firefly larvae uses their luminescence as a warning signal (aposematism) to communicates with potential predators that they taste bad because of the defensive chemicals in their bodies."