🤓 Fireflies have a light-emitting organ at the end of the abdomen. Here, a chemical called luciferin is burned with oxygen with the help of luciferinase enzyme. The molecules stimulated in this way emit light to the environment. This phenomenon is commonly called bioluminescence. The wavelength and intensity of the emitted light depends on the type of lucife. The most well-known fireflies have been found in D-luciferin, but also in different varieties of fungi, bacteria and various sea creatures.