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 one of Wyoming’s most-recorded rodents, with 1,890 entries statewide.
That volume comes almost entirely from field surveys rather than public sightings; all 1,890 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. Yellowstone National Park alone accounts for 1,349 of the records, with Medicine Bow National Forest a distant second at 41, 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 August at 593 records, with July and September close behind, before dropping away by October, a curve that tracks fieldwork schedules more closely than the mouse’s own year-round activity.
Full species profile
