A cold, cold world! -- Keeping warm -- The polar bear -- Whales are mammals -- The beluga -- The narwhal -- The bowhead -- Pinnipeds -- The walrus -- Arctic birds -- The murre -- The snowy owl -- The raven -- The gyrfalcon -- The ptarmigan -- Arctic food chain -- Polar fish and insects -- Caribou and reindeer -- The muskox -- The Arctic ground squirrel -- The collared lemming -- The Arctic hare -- The Arctic fox -- The Arctic wolf -- The husky -- The wolverine -- The ermine -- A fragile world.