Bestiaries are the most gloriously entertaining books to have come from the Middle Ages. Written and illuminated by monks, they describe every creature thought to exist in the medieval world and include all manner of fish, fowl, and mythological beast, however far-fetched. Pauline Baynes, whose original line illustrations for J. R. R. Tolkien's The Lord of the Rings and C. S. Lewis's The Lion, the Witch and the Wardrobe are known...