The leading hypothesis for the origin of firefly lights has been overturned by a genomic analysis. It had been posited that the bright lights emitted by many species in the Lampyridae family of beetles—better known as fireflies—first evolved as a warning signal to predators, advertising the toxicity of fireflies, and were then repurposed as a mating signal. This explanation would account for why eggs, larvae, and pupae also glow.
