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Species
Baird's deer mouse
Peromyscus maniculatus
Rodents
Species Overview
The deer mouse is the most widespread native rodent in North America. The Baird's subspecies (P. m. bairdii) occupies grasslands and agricultural fields of the central United States. Adults weigh 15–25 g with a bicolored tail (dark above, white below), large dark eyes, and prominent ears. Dorsal fur ranges from grayish-brown to tawny, with a sharply demarcated white belly. They are nocturnal, omnivorous (seeds, insects, berries), and construct nests in burrows, logs, or buildings. They are a model for ecological and evolutionary genomics—coat color adaptation to substrate color (light mice on sand, dark mice on dark soil) is a classic example of natural selection involving the Agouti gene. They are also the primary reservoir of Sin Nombre hantavirus, a cause of hantavirus pulmonary syndrome (HPS) in humans. Females produce 2–4 litters/year of 3–7 pups after a ~23-day gestation. Lifespan: ~1–2 years in the wild, up to 8 in captivity. Their genome is sequenced. IUCN: Least Concern.
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