Wyoming’s file on the plains pocket mouse is empty for 2000 to 2026. Older records came mostly from Goshen County in the state’s southeast corner. That’s the North Platte lowland, where sandy shortgrass habitat reaches in from the Nebraska panhandle, and it’s about as far from Wyoming’s famous sagebrush basins as the state gets.
Older records in the east
The Red Desert and the Green River corridor in the state’s dry southwest look like plausible ground too, but none of the older records came from there. That gap doesn’t clear the southwest of the mouse. It may only mean observers have barely looked, and a confirmed sighting from the Red Desert would matter more than a dozen from Goshen County.
A short summer window
Pocket mice pass the deep winter in torpor, and young animals only appear from midsummer on, so summer is when a new Wyoming record is most likely. Few people survey small mammals on the high plains in the off-season, and one good field season could put the species back in the current record.
Status in Wyoming
NatureServe ranks the species S2, imperiled, in Wyoming, a sharp step down from its secure global standing. The mouse is native here, living at the northwestern fringe of its range, and fringe populations are always the easiest to lose and the slowest to confirm. With no records since 2000, nobody can say how many mice Wyoming holds, or whether the sandy southeast corner still holds them.
Full species profile
