Historians and cultural critics face special challenges when treating the nonhuman natural world in the medieval and early modern periods. Their most daunting problem is that in both the visual and written records of the time, nature seems to be both everywhere and nowhere. In the broadest sense, nature was everywhere, for it was vital to human survival. Agriculture, animal husbandry, medicine, and the patterns of human settlement all have their basis in natural settings. Humans also marked personal, community, and seasonal events by natural occurrences and built their cultural...