Booklist called Stuffed! "a thought-provoking morality play," which I thought was kind of fascinating. It is not every book that gets to be a morality play, much less a thought-provoking one.
So: if we accept Booklist's description, here's what Merriam-Webster says a morality play is: "something which involves a direct conflict between right and wrong or good and evil and from which a moral lesson may be drawn."
Moral lessons through taxidermy! How most excellent.