When a hippo follows him home, Robert is pleased - but his parents are not! As more and more hippos crowd into the garden they turn to a witch for help.
| Author | Margaret Mahy |
| Publisher | Mammoth |
| Year of publication | 1989 |
| Number of pages | 32 |
| Language | English |
| Format | Paperback |
| ISBN-10 | 749700947 |
| ISBN-13 | 9780749700942 |
| Illustrator | Steven Kellogg |
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