The concept of "rat" includes various genera of rodents, such as Rattus, Neotoma, and Dipodomys, which are typically differentiated from mice mainly by size. Literature has long examined rats from multiple perspectives: Douglas English depicts them as watchful and solitary, as illustrated by his portrayal of a black rat detecting unfamiliar noises, while F. St. Mars contrasts invasive brown rats with native black rats, emphasizing ecological conflicts.
Other texts, such as The Irish Penny Journal, highlight rats' ability to adapt to human environments, even as they become subjects of scientific experimentation. Writers like A. L. O. E. and Mayne Reid incorporate their cleverness or threat into narratives, illustrating cultural uncertainty. Bringing these viewpoints together, rats appear as both ecological players and symbols of human engagement, connecting scientific inquiry with literary creativity.