The nascent global age at the close of the Middle Ages introduced exotic objects from distant lands into Western Europe. Exotica from the natural world – naturalia – were frequently fashioned into ecclesiastical and seigniorial artifacts and housed in treasuries. The materials were sometimes re-identified in their new contexts, such as narwhal tusks understood as unicorn horns, which bestowed upon them additional meanings associated with those allegorical mythical creatures. This work investigates the movement, alteration, and use of such re-identified naturalia in late medieval society leading up to the Age of Discovery. It focuses on naturalia that retained their distinct morphological features after working, following the hypothesis that the identity of the animal, as indexed by a recognizable form or set of physical characteristics, was important. 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