Invisible Pets Magic Picture Book

What water-loving animal - a favourite with youngsters at home and in the classroom - carries its home on its back? And what creature gets lots of exercise by running in a wheel in its cage? To learn the names of these and 14 other ""invisible"" pets, simply rub the blank space on each page with the tip of a pencil and make the answer ""magically"" appear. A brief caption identifies and provides information about each animal.