The moon tiger scratches at shooting stars, polar bears floats down from their mountain for starfish and chips, and the zookeeper, of course, is an alien. Carol Ann Duffy`s lyrical, humorous verse illuminates a world that is both familiar and strange.The moon tiger scratches at shooting stars, polar bears floats down from their mountain for starfish and chips, and the zookeeper, of course, is an alien. Carol Ann Duffy`s lyrical, humorous verse illuminates a world that is both familiar and strange.