This introduction sketches a cultural history of dinosaur palaeontology in the nineteenth and early twentieth centuries, indicating how the book addresses the lack of literary work on the understanding of dinosaurs in this period. While dinosaurs were a British area of science in the first half of the nineteenth century, American palaeontologists took clear pre-eminence in this field from the 1870s. American research transformed dinosaurs from giant lizards into a far stranger and more heterogenous group. Fallon argues that literary scholars have not yet grappled with this cultural shift in perceptions of the dinosaurs, an omission made all the more striking by the fact that it was during the decades around 1900 that ‘dinosaur’ first became a household word. Built into this word were important ideas about imperialism, progress, romance, and the practice of science. Fallon explains how exploring this subject provides wider insights into the relationships between literature and science and between popular and specialist science writers, in addition to its value as a case study on the transatlantic nature of literary media at the end of the nineteenth century.