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Description"Keen's Deermouse is the most common deermouse in the Pacific Northwest. It inhabits rainy, mild climate zones at higher elevations than the closely-related Deermouse (Peromyscus maniculatus), and prefers areas where the forest canopy is somewhat open. Observers report that it is very good at climbing and jumping. It is often a pest in rural areas, especially in winter, because it readily moves into buildings."
Mammal Species of the World