Some cicadas live underground for 17 years! This is a normal part of the insect's life cycle, even though it might seem extreme to us. What do they do for all those years? How do they know when it's time to come up? Readers find the answers to these questions and many more about cicadas' life cycles in this memorable guide to a basic biology concept. This exciting take on the familiar topic of life cycles keep readers engaged as they learn important facts. In addition, full-color photographs of cicadas at different stages of their life cycles are included.