Comparative Ecology of Pinyon Mice and Deer Mice in Mesa Verde National Park, Colorado by Charles L. Douglas is a scientific study that focuses on the ecological relationships and differences between two small mammal species: the Pinyon Mouse (Peromyscus truei) and the Deer Mouse (Peromyscus maniculatus). The research takes place in the distinct ecosystem of Mesa Verde National Park in Colorado, an area known for its semi-arid climate and pinyon-juniper woodlands.Douglas begins by outlining the physical environment of Mesa Verde National Park, describing the habitats where both species are commonly found. The study aims to compare and contrast the ecology of these two closely related species in terms of habitat preferences, feeding behavior, reproduction, population dynamics, and interactions with other species.