Did you know that one sheep can grow up to 30 pounds (13.6 kilograms) of wool in a year? Sheep live in groups called flocks. Learn more about these fascinating farm animals in Sheep, a Farm Animals book. This is an AV2 media enhanced book. A unique book code printed on page 2 unlocks multimedia content. This book comes alive with video, audio, weblinks, slide shows, activities, hands-on experiments, and much more.