Natural history collections function primarily as biodiversity repositories for scientific study and education. The collection at the Naturalis Biodiversity Center (formerly the National Museum of Natural History) in the Netherlands is one such collection. It is over two hundred years old and contains 43 million specimens, including a number that predate the founding of the museum in 1820. These older specimens often use animal bodies in ways that are outside the boundaries of contemporary scientific practice. The oldest specimens in the Naturalis collections thus fluidly intersect the domains of religion, mythology, and art, and occupy an uncomfortable place within the larger collection and the scientific ordering systems that define it. This chapter seeks to understand the hybrid, fictionalised, or aesthetically-constructed objects in the collection through concepts borrowed from contemporary art: appropriation and assemblage.