Many mammals, including wolves, wildebeests, and orcas, find strength in numbers. Some work together to hunt for food or defend their territories. For others, being part of a large group provides protection from predators, allowing more animals to safely migrate and reproduce. Mammal Groups explores how and why different mammal species form groups. Easy-to-read text, vivid images, and helpful back matter give readers a clear look at this subject. Features include a table of contents, infographics, a glossary, additional resources, and an index. Aligned to Common Core Standards and correlated to state standards. Core Library is an imprint of Abdo Publishing, a division of ABDO.