South Dakota’s 67 plains pocket mouse records sketch the sandy southern tier of the state. Bennett and Tripp counties, side by side along the Nebraska line, hold 42 of them between them, and most of the rest trail up the Missouri River corridor through Potter County. Records always reflect where observers have worked, but this pattern tracks real habitat too: a mouse that digs its living needs loose soil, and the glaciated country farther east and north offers far less of it.
Lake country and river breaks
The single richest named site is Dog Ear Lake, a small state recreation lake with 14 records, followed by West Whitlock Recreation Area on the shore of Lake Oahe with 9. Both mix open grass with sandy, erodable banks, the sort of ground where burrow entrances are easy to dig and easy for a survey crew to spot. Badlands National Park and the Black Hills get suggested as viewing country, yet Pennington County, which contains a big share of both, shows only 2 records, a reminder that famous habitat and documented habitat aren’t the same thing.
A July and August crest
Nearly 70 percent of South Dakota’s reports landed in July and August, when females are finishing litters and newly independent young start turning up in traps and headlights. The mouse is present and active from spring through fall and rides out winter in bouts of torpor below ground, so the midsummer crest mixes genuine peak activity with peak survey season.
Status in South Dakota
NatureServe ranks the plains pocket mouse S5, secure, in South Dakota, one of the few states at this end of its range where it earns that grade. It’s native here, and the south-central counties give it room: wide, dry, lightly developed country with plenty of diggable ground. That doesn’t make the records a population count, but it does make South Dakota one of the species’ steadier strongholds on the northern plains.
Full species profile
