Animals have been a vital element in the development of mythological systems throughout history, across virtually every culture imaginable. In Western societies of the Middle Ages, in particular, animals represented specific traits and could therefore be utilized as symbols to convey moral and religious lessons in works of art. Animals can represent victims of technology, industrialization, or war. Also, animals sometimes equate with the concept of “purity,” existing in a wild, natural state and therefore utterly free from man’s sins and vices. Some passion plays and other didactic forms of theater utilized animal imagery to represent specific modes of behavior, including human vices.
John Kenneth Muir. Back to Frank Black: p. 196