Who knew wolves were so important to a place? For nearly 70 years there had been no wolves in Yellowstone National Park. Then in 1995, ten adult wolves were brought to the park from Canada. The Wolves Are Back by Jean Craighead George tells how their presence brought other animals back to the area, helped flowers to grow, and even stopped erosion. Amazon.com suggests it for children ages 4 to 8, but everyone will appreciate the beautiful illustrations by Wendell Minor and the straightforward explanation of the importance of wolves in the ecosystem. Reading this book me made me think about other animals in a new way too, like spiders and bats.