Nevada holds 379 documented southwestern jumping mouse records, more than any other state in its range, all of them squeezed into a three-month window between June and August.
The state that anchors this mouse’s range
Every Nevada mountain range that hosts this species does so as its own island of wet meadow, cut off from the next by dry basin floor the mouse can’t cross. The Ruby Mountains and the Humboldt-Toiyabe’s other ranges hold damp, streamside meadows fed by snowmelt long into summer, while the Spring Mountains near Las Vegas rise as a cooler, wetter outpost surrounded by Mojave Desert, hundreds of miles from the next cluster of records in this set. That kind of mountain-island spread is a defining feature of Great Basin wildlife, and this jumping mouse is a clean example of it.
Underground for most of the year
The complete absence of records outside June through August isn’t a gap in reporting so much as biology. This jumping mouse hibernates through the cold season, living off stored body fat rather than a cache of food, and in Nevada’s high mountain ranges that dormant stretch can run the better part of the year. Above ground, it has a narrow window to feed on grass and herb seeds, breed, and build enough fat to survive winter in a den separate from its summer meadow.
Status in Nevada
Nevada lists the southwestern jumping mouse as native to its mapped range, though NatureServe hasn’t assigned the state a distinct subnational rank here. Nationally it’s rated Least Concern, but its Nevada range depends entirely on damp mountain meadows staying intact from one isolated range to the next.
Full species profile
