Description Gray wolves are a keystone species. Without them, many other animals and plants would be in danger of dying out. Readers of this fascinating book will learn exactly why these fierce hunters are such an important part of ecosystems. Eye-catching photographs bring readers face-to-face with these great predators and hold the attention of even the most reluctant readers. Meanwhile, informative and engaging text helps reinforce essential lessons from the elementary science curriculum. Young wolf enthusiasts will appreciate this captivating volume as much as they appreciate the creatures it is about.