On the Arctic tundra, predator and prey alike are aided by fur or feathers the color of snow. Some, like the Gyrfalcon and Snowy Owl, stay white year round; others, like Ptarmigan and Snowshoe Hare, turn white for winter. Forcing its inhabitants to migrate, adapt, or perish, the world's harshest, yet most sensitive, environment is the setting for a continual life-and-death drama.