In the United States, someone filmed a small scene unfolding on their front porch. As a frog stood motionless nearby, a firefly flew past. Before the insect could even get away, the amphibian leaped forward and swallowed it whole.

But moments later, an unexpected phenomenon occurred: the frog’s belly began to glow in the dark. The firefly continued to emit light from inside its predator, creating a scene that was both amusing and unusual.

Fireflies produce their light through a chemical reaction called bioluminescence. In some species, this ability can continue to function for a short time, even after being captured, which explains this surprising “glowy belly.”