5With Gray Wolves: Yellowstone's Hunters, kids will discover how gray wolves influence their ecosystems. Young readers will learn where gray wolves live and how they affect their environment, their role in the food web, and the dangers they face. The book ends with a Fun Facts page, a quiz, and a glossary. Aligned to Common Core Standards and correlated to state standards. Super Sandcastle is an imprint of Abdo Publishing, a division of ABDO.