This was picked for book group.
From the Appendix:
"A Bestiary is a serious work of natural history, and one of the bases upon which our own knowledge of biology is founded, however much we may have advanced since it was written.
"There is no particular author of a bestiary. It is a compilation, a kind of naturalist's scrapbook, which has grown with the additions of several hands. Its sources go back to the most distant past, to the Father of the Church, to Rome, to Greece, to Egypt, to mythology, ultimately to oral tradition which mush have been contemporary with the caves of Cromagnon. Its influence has extended throughout literature, and, as has been seen in the Notes, country people are still repeating some of its saws.
"The meaning of symbolism was so important to the medieval mind that St Augustine stated in so many words that it did not matter whether certain animals existed; what did matter was that they meant."
This Beastiary was quite humorous and bizarre, simple and quick to read. It is a curious look into the Medieval mind and how they viewed nature (everything has a meaning!). This is the type of text that Tolkien and Lewis would've been steeped in; also I saw bits that Rowling drew from directly.