Hergé did not want to displease the editors, recognising that "Cœurs Vaillants" was his only foothold in the French market at the time. He later related that "I happened to have some toys at home just then, for an advertising project I was working on, and among them was a monkey named Jocko. And so I based a new little family around Jocko, really just to please the gentlemen from "Cœurs Vaillants", telling myself they might have the right idea." Taking on "Jo, Zette, & Jocko" alongside "The Adventures of Tintin" and "Quick & Flupke", Hergé soon found himself overworked, and put the latter series on the back burner.