Did you know that fireflies and some other insects, including glowworms, make their own light? This amazing ability is called bioluminescence. Some glow to attract mates, scare off predators, or find food. Look inside to learn all about fireflies and glowworms--and get ready for a glow show! Includes a table of contents, glossary of key words, index, author biography, sidebars, and a feature about related glowing creatures.