Deer mice are one of the most widespread native rodents in North America, and Montana’s 84 records trace a wide range of habitat, from Red Rock Lakes National Wildlife Refuge’s high wetland basin to Flathead Lake’s shoreline woods and brush along the Missouri River corridor, showing how little this mouse depends on any single habitat type.
Records carry two peaks, April and a stronger one in July, rather than one clean season, a pattern that likely mixes spring breeding activity with summer trapping-survey effort more than one true seasonal high. Every one of the state’s records comes through GBIF specimen data rather than a photograph, typical for a small nocturnal mouse that’s rarely seen and easily confused with its relatives.
Full species profile
