The book is about a zoo keeper who makes his animals clean the zoo. After the zoo is closed the animals had grumbled but the zoo keeper made the animals clean the zoo. Anyway, towards the end of the book the zookeeper makes a sign that says 'Don't Rubbish Our Zoo' so the animals don't have to clean the zoo.  I give this book 7 out of 10 because he made the animals clean the zoo.