Gibber is the monkey which Captain Flint gives to Roger Walker as his reward for his part in finding the stolen manuscript of Mixed Moss. Unlike Polly, Titty's parrot, Gibber only appears in two "Peter Duck stories", specifically Peter Duck and Missee Lee although he is occasionally mentioned in some of the other books as spending time at the zoo while Roger is on holiday. Gibber appears in the early incarnation of Peter Duck, 'Their Own Story' (published in CFT) – in this text his name oscillates between Gibber and Jacko.