The children find it hard keeping pet swapping day a secret from the teachers when jumpers bulge with moving shapes, strange creatures slither from lunch boxes and unknown things try to escape from paper bags.
| Author | Susan Gates |
| Publisher | Scholastic |
| Year of publication | 1996 |
| Number of pages | 80 |
| Language | English |
| Format | Paperback |
| ISBN-10 | 590139886 |
| ISBN-13 | 9780590139885 |
| Illustrator | Lucy Keijser |
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