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

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

This book was published 1997 by Kingfisher .

Amanda O'Neill has worked in education since 1976 and has been a freelance writer and editor since 1986. She has written books on a wide range of subjects, including many on the animal kingdom with titles such as I Wonder Why Snakes Shed Their Skin. Amanda lives in Leicestershire with her family, rescue cat Jess and a whole host of reptiles, bugs and other creatures.