Iowa’s 27 southern bog lemming records tilt noticeably south. Fremont County, in the state’s southwest corner along the Missouri River bottoms, leads with 8, and most of the rest come from the southern tier of counties between Page and Davis. For a stocky little rodent that lives in wet meadow and sedge, Iowa’s remaining marsh edges and damp grass are the whole game.
Not tied to bogs, and no mass marches
Despite the name, southern bog lemmings don’t need true bogs. Any dense, moist cover works: sedge meadow, wet prairie, a grassy seep, even a damp fencerow. They travel hidden runways beneath the vegetation, feeding on grasses and sedges, which makes them nearly impossible to spot without a trapline. And unlike the legendary marching lemmings of the far north, these stay put.
A winter-weighted calendar
December leads the Iowa record with 7 reports, and March and September add smaller rises. Bog lemmings don’t hibernate; they work their runways under the snow all winter, so the cold-season records likely reflect trappers and survey crews meeting an animal that stays active when the rest of the small-mammal world has gone quiet. The newest Iowa record dates to April 2020.
Status in Iowa
NatureServe ranks the southern bog lemming S3, vulnerable, in Iowa, though the species is secure across its full range. It’s native here, at the western edge of a mostly eastern range, and Iowa’s drained and plowed landscape leaves it few of the wet meadows it needs. Records from 15 counties sketch a wider footprint than the totals suggest, but each rests on a patch of damp grass that could disappear with a single drainage project.
Full species profile
