Animals occupy an important place in literature. They carry a rich variety of symbolic association often drawn from the past as the lamb, which serves as an important sacrificial animal in most of the religious rites in the world. Animals also serve as vehicles for religious allegory and moral instruction. Sometimes a collection of descriptions and interpretations of animals are used to convey and give a moral or a religious lesson. Man's ways have been developed to serve the requirement of various ages. Their aim is didactic, i.e., the moral is disguised in an entertaining way. Almost all literary works exist in order to entertain and to communicate something− ideas, morals, facts, or a sensation. The ultimate question of didacticism in a literary work is related to the hidden intent of the author or his ostensible purpose. Horace said in Ars Poetica that the primary goal of the artist is to instruct. The artist is didactic in intent and the purpose of the work produced is didactic because it has as its ultimate effect a meaning or a result outside itself except in the Art for Art's movement. This paper sheds light on the use of animals for didactic purposes in Arabic literary work ‘the Arabian Nights (One Thousand and One Nights)’ which is relevant not only to the literature of one nation but for all the tradition of literature.