This book is part of a book series called I Wonder Why .

This book has been graded for interest at 5-8 years.

There are 32 pages in this book. This book was published 1994 by Kingfisher .

Anita Ganeri is an award-winning author of children's books, specializing in geography. Tony Kenyon was for many years an advertising art director in San Francisco and Hawaii. He is now concentrating on writing and illustrating picture books. He lives in Winchester.