Firefly

Have you ever even seen a firefly?

The firefly was eaten by a toad.

It's a firefly.

The firefly, the bee, the hummingbird ... With such beings, what do I have in common?

Crowds will gather in two forests in the United States in coming weeks to see light shows created by a rare species of firefly.

They found an extinct species of firefly.

They found a species of firefly that was assumed to be extinct.

2000, Exploring Life Science, 2: Bats—Cave Life, Marshall Cavendish, page 96, Fireflies are the best-known insects that produce light. […] Many fireflies use their light to communicate, particularly at mating time when males and females have to get together.

The luciferins are different in different species and today both the luciferin and luciferase in the firefly are available in the crystalline form.

Various other luciferase genes, especially the firefly luciferase gene, are also used for the study of gene regulation.[…]The classic use of bioluminescence, however, is the use of a luciferin-luciferase mixture from fireflies as an assay for ATP.