The deer mouse is named for its distinctive fur colouring, which resembles the coloration of a deer—dark on the back and light on the belly. This bi-coloured appearance is characteristic of many deer species, where the fur’s coloration provides camouflage in their natural woodland habitats. Similarly, the deer mouse’s colouring helps it blend into its environment, offering protection from predators. The name “deer mouse” specifically refers to the species Peromyscus maniculatus, part of a larger group of mice in the Peromyscus genus, often called “New World mice” due to their prevalence in North America. The deer mouse’s large eyes and ears, reminiscent of a deer’s alert and sensitive nature, contribute to the naming.