"Slavic Bestiary" is the first attempt at a dictionary code built on the material of monuments of Eastern and South Slavic literature of the 12th–17th centuries, which combines a dictionary of names and a dictionary of animal symbolism. The specificity of the medieval “scientific” description and the belonging of most “natural science” texts to the hermeneutic direction of bookishness determined the main feature of the book’s “vocabulary of nature”: the names of zoomorphic characters act not only in a nominative function, but also have extensive symbolism. The inclusion of fragments of traditional folk ideas (etiological legends, signs, beliefs, as well as names with mythological connotations) into book tales about animals clearly shows the inextricable connection of Slavic “zoological” vocabulary with the ethnocultural context. The dictionary has 1117 entries and 16 reference words. The publication is illustrated with miniatures of manuscripts from the largest Russian archives. For specialists and a wide range of readers.