This series is chock-full of information, presented in an engaging format. The focus is on how and why certain animals form groups. Within that context, readers will come away with plenty of facts about the creatures' physical characteristics, diet, habitat, social behavior, and predators. While each title promises information on other groups, the titular animal gets the limelight: a couple of others are briefly mentioned in each volume, mainly for comparison. The text is nicely sized and interspersed with captioned, eye-catching photographs. Text boxes offer additional tidbits, including information about human interaction and endangered habitats. Each volume contains a helpful food-web diagram along with abundant back matter. Solid choices for libraries looking for report-writing or browsing materials for middle grade students. -- Kim Dare, Fairfax County Public Schools, VA School Library Journal "Series Made Simple" 11/1/2012-- "School Library Journal"