WCIA-TV (May 17) – “Lightning bugs, sometimes called fireflies, are fascinating beetles that emit light to attract mates. They are a staple in the backyards in Illinois in the spring and summer months and are fascinating for humans and animals alike,” said Dr. Krista Keller, a board-certified specialist in zoological medicine at U of I’s Veterinary Teaching Hospital. “However, even though many lizard species thrive on a diet composed of insects, these light-emitting bugs are toxic and should never be fed to reptiles or amphibians.“
https://www.wcia.com/news/u-of-i-veterinarians-warn-of-lightning-bug-danger-for-bearded-dragons/