Book excerpt: This book is part of the TreeTops Non-Fiction series which are full of fascinating facts and have been produced with stunning artwork and photography in a lively and modern design sure to attract all young readers. This book is also available as part of a mixed pack of 6 different books or a class pack of 36 books of the same Oxford Reading Tree stage. Each book pack comes with a free copy of up-to-date and invaluable teaching notes.