"This is the Arctic. It sits on the top of the world--a frozen sea in a circle of land. On a journey to the North Pole and back, and from fall to spring, the story begins and ends with the extraordinary wood frog, a tiny creature that freezes for the long Arctic winter. On the way we meet polar bears, an Arctic fox, narwhals, and many other animals, discovering how each one is perfectly adapted for life on the tundra, in the ocean, and on the ice."--Publisher marketing.