The first book in the line, "Bunnikin's Picnic Party: a story in verse for children with illustrations in colour", was produced in 1940. The book featured stories in verse written by W. Perring, accompanied by full-colour illustrations by A. J. (Angusine Jeanne) MacGregor. The appeal of Bunnikin, Downy Duckling and other animal characters made the book an instant success. Later series included nature books (series 536, some illustrated by, for example, Charles Tunnicliffe and Allen W. Seaby) and a host of non-fiction books, including hobbies and interests, history (L du Garde Peach wrote very many of these) and travel.