Large, black, flightless birds with unpredictable tempers and colourful heads and necks, cassowaries have enthralled European audiences for centuries, but perhaps no one more so than private collector and zoologist Lionel Walter Rothschild (1868-1937). Throughout the late 19th and early 20th centuries, Rothschild acquired hundreds of living cassowaries which were kept in his private zoological collection. This paper explores the nature of Rothschild's private zoo and how the collection of living cassowaries was used to support his zoological activities. Spread across (...) three sites-the family estate at Tring Park, the zoological gardens in Regent's Park, and the business premises of Cambridge-based taxidermist Frederick Doggett-it will examine how Rothschild used the living birds kept in his private zoo to devise and inform a process for the preparation and display of cassowary specimens in museum galleries. It will show how he recruited specialist artists and taxidermists to perfect the art, and the significant financial investment this entailed. This is followed by exploration of how Rothschild's access to and observations of living birds informed his taxonomic work and, in particular, the identification of species and subspecies. The argument is made that Rothschild's private zoo and access to living cassowaries enabled his dedication to the study of the genus and ultimately underpinned his reputation as a world authority on cassowaries in the early 20th century. (shrink)