What do different parasites look like under the microscope? Readers find out with this engaging look at a fascinating group of living things. The comprehensive main text discusses the different kinds of parasites that exist in the world and their specific functions within ecosystems. As readers explore the creative design, which features helpful fact boxes and full-color photographs, they enhance their knowledge of biology and how science is at work in the world around us. This complex topic is presented to young readers through accessible language that makes complicated science concepts easy to understand and fun to learn about.