Fireflies all havin’ fun

Kevin Zini captures fireflies dancing in the evening with a Northern Lights back drop. Fireflies emit light mostly to attract mates, as well as defend territory and warn predators away. In some firefly species, only one sex lights up. In most, however, both sexes glow; often the male will fly, while females will wait in trees, shrubs and grasses to spot an attractive male. If she finds one, she’ll signal it with a flash of her own. Firefly lights are the most efficient lights in the world with 100% of the energy that is emitted as light. Compare that to an incandescent bulb, which emits 10% of its energy as light and the rest as heat, or a fluorescent bulb, which emits 90% of its energy as light.