 It primarily fuses three of the books, "The Story of Doctor Dolittle" (1920), "The Voyages of Doctor Dolittle" (1922), and "Doctor Dolittle's Circus" (1924).Numerous attempts to adapt the "Doctor Dolittle" series began as early as the 1920s.In the early 1960s, actress-turned-producer Helen Winston acquired the film rights in an attempt to produce a film adaptation to no success.