In five brief episodes two hippopotamuses reinforce their friendship.
- ISBN10 0416825907
- ISBN13 9780416825909
- Publish Date 18 March 1976 (first published 19 September 1973)
- Publish Status Out of Print
- Out of Print 14 May 1992
- Publish Country GB
- Publisher Egmont UK Ltd
- Imprint Methuen young books
- Format Hardcover
- Pages 48
- Language English