On nearly every construction site, cranes are hard at work lifting heavy materials. The largest cranes are used to build skyscrapers and oil rigs while smaller gantry cranes can help factory workers move heavy boxes from place to place. In this informative, approachable text, young readers will discover different types of cranes and how workers use them every day. With full-color photographs, young readers will see cranes up close and learn about the largest cranes in the world!