Five brief episodes about two friends, George and Martha, who happen to be hippopotamuses.
- ISBN10 072265734X
- ISBN13 9780722657348
- Publish Date 25 February 1982 (first published 29 September 1976)
- Publish Status Out of Print
- Out of Print 14 May 1992
- Publish Country GB
- Publisher Penguin Books Australia
- Imprint Viking Children's Books
- Format Hardcover
- Pages 48
- Language English