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Among all the published medieval bestiaries, the short piece called Les Dits des Oiseaux stands out as a singular work. It is striking first and foremost because of its longevity: two handwritten copies in the fifteenth century were followed by a few printed versions, but it lived on within a rather heterogeneous work known as the ancestor of the almanac, Le Grand Calendrier et Compost des Bergers (The Shepherds' Great Calendar and Compilation). The present paper examines developments in the composition of the work through its several editions, from the fifteenth to the eighteenth century. It then compares its contents to the traditional contents of bestiaries and, more particularly, of volucraries.