Keystone species are animals or plants that play a crucial role in different habitats and have a huge effect on the environment around them. Entire ecosystems can depend on a single species, and they act as a glue that holds the ecosystem together? This book introduces readers to keystone animals across all five major biomes (aquatic, grassland, forest, desert, and tundra) with facts about wildlife, habitats, and modern conservation practices to protect these species.