Readers will find out what makes fireflies glow as they discover fun facts about these incredible glow-in-the-dark insects. Fireflies glow for many reasons, including attracting mates and even other species of fireflies to eat! The biology behind a firefly’s glowing body and the ways it uses its glow are just some of the things readers learn as they explore informative text and helpful fact boxes. Colorful images of fireflies show these insects glowing in beautiful detail.