As early summer arrives, many fireflies can be seen in the dark woods of Osaka (大阪) in Japan. Look, it’s like they are carrying tiny lanterns. But why do those little bugs glow (发光)? Do they do it to see more clearly in dark? In fact, one reason is that the light can scare away their enemies. But sometimes, male (雄性) fireflies also use the light to attract females! They are showing off (炫耀) how beautiful they are.