This is a simple retelling of the story of Isle Royal, an island that was brought back into ecological balance when a wolf pack crossed over an ice bridge to the island. Before that time the vegetation was being denuded by moose, and the moose herd was suffering. The island was the living laboratory for some of the classic research on the relationship between predators and their prey, and the role of predators in an ecosystem. It also relates to another classic essay by Aldo Leopold, called "Thinking Like A Mountain." again, about wolves and their relationship to their prey and to the ecosystem as a whole. These concepts are important to teach young children, but the research and essay above would be hard for young kids to understand. This book serves as an excellent introduction to the topic. There are few books out there that tackle this important subject, this book fills the niche.