By spotting clues in the illustrations and fold-out picture, the reader is asked to help chase away creatures from another planet who are creating havoc at the zoo.
- ISBN10 0812061020
- ISBN13 9780812061024
- Publish Date 1 January 1989
- Publish Status Out of Print
- Out of Print 9 November 2015
- Publish Country US
- Imprint Barron's Educational Series
- Format Hardcover
- Pages 20
- Language English