%26quot%3BI have long thought of Yellowstone in winter as an albino desert of snow dunes where much of the water is locked up in crystalline solids%2C%26quot%3B Fuller observes. %26quot%3BIn Yellowstone%2C as in Namibia%2C the landscape is often animated by large spectacular animals. Here a bull bison makes his way across the mid-winter snowscape%2C a harsh environment of deep cold and deep snow but one in which he is at home.%26quot%3B