Dall sheep are known as an only wild white sheep, found only in central and northern Alaska, and the Yukon Territory, Canada. Dall sheep stay in such places as open ridges and steep slopes with extremely rugged ground, to allow escape from predators. But such habitation makes it difficult for photographers to catch a sight of their living. Uemura moved to Canada with his wife and kept following Dall sheep. This book features more than 80 photos selected from his archive.