Few Wyoming mammals turn up in more kinds of places than this one. It’s recorded in river bottoms, woodlands, grasslands, farmland, and even around buildings, and that habitat generalism helps explain why it’s the single most-recorded small mammal among Wyoming’s rodents, with 6,189 entries statewide.
That volume comes almost entirely from field surveys and museum records rather than public sightings; all 6,189 records are GBIF entries, with none logged through iNaturalist. Trapping studies are the main reason for that split, since researchers routinely sample this species to track disease and population health, including its role as a known reservoir for hantavirus in parts of its range. Reports are common near Seedskadee National Wildlife Refuge, the National Elk Refuge, and the Yellowstone River corridor, though given how widely the species is distributed, those locations say more about where surveys happened than where the mouse is limited to.
The month-by-month counts follow a familiar shape too, rising through spring and cresting in July at 2,077 records before tapering off by fall, a curve that tracks fieldwork schedules more closely than the mouse’s own year-round activity.
Full species profile
