Nebraska mammals

Southern Bog Lemming in Nebraska

Synaptomys cooperi

Native to Nebraska SU Unrankable in Nebraska

Not listed as nonindigenous in Nebraska by USGS NAS; native to its Nebraska range.

IUCN Red List status

  1. LC
  2. NT
  3. VU
  4. EN
  5. CR
  6. EW
  7. EX

LC – Least Concern

Widespread and abundant; not at risk.

Southern Bog Lemming in Nebraska, by the numbers

Occasional in Nebraska 40th most recorded of 95 mammals logged in Nebraska

36 occurrence records

Records from 2000–2026.

36 total records count every Nebraska occurrence from GBIF and iNaturalist; the monthly chart covers the 35 records with a full observation date.

When to look for the Southern Bog Lemming in Nebraska

Most sightings fall in November.

35 Nebraska occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly Nebraska records (table)
MonthRecords
January3
February0
March0
April3
May11
June0
July0
August2
September0
October0
November15
December1

Monthly southern bog lemming occurrence records (iNaturalist and GBIF) in Nebraska, 2000–2026.

Seasonality

Year-round in Nebraska, with recorded sightings peaking in November, with a smaller rise in May.

Occurrence map

Where Southern Bog Lemming has been recorded in Nebraska

36 records mapped · zoom and drag to explore

36 Nebraska records mapped

Where it's recorded in Nebraska

CountyRecords
Gage County 7
Richardson County 7
Cass County 6
Dundy County 6
Lancaster County 2
Holt County 2
Harlan County 1
Franklin County 1
Saline County 1
Butler County 1
Seward County 1
Nuckolls County 1

The complete county distribution, spread across 12 Nebraska counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Nebraska sits near the western edge of the southern bog lemming’s range, and its 36 records are spread thin to match: 12 counties, none holding more than 7 reports. The records lean to the southeast, where Gage, Richardson, and Cass counties lead the list, with an outlier group in Dundy County in the state’s southwest. A scatter like that suggests a species that reaches into Nebraska wherever it finds the right wet ground, not one concentrated anywhere.

Late-year reports, and what they mean

Fifteen of the 36 records were logged in November, with a smaller May rise of 11. Because these lemmings don’t hibernate and travel under snow through the winter, a late-autumn crest most likely marks when trap lines were out, not when the animals were. With 36 records spread over more than two decades, no single month carries much signal.

Habitat on paper versus records on the map

The wet-meadow country that suits the species best, the Sandhills wetlands around Valentine and Crescent Lake national wildlife refuges and the grassy margins of the Platte River, holds exactly the dense, damp cover it needs, yet confirmed records haven’t piled up at any of those places. NatureServe leaves the species unranked in Nebraska (SU), meaning there isn’t enough information to grade its standing. For a secretive rodent at the edge of its range, that unresolved grade fits a state where the record is still being written.

Occurrence data from GBIF.

More mammals in Nebraska in the atlas

Data & sources

The data and visualizations on this page draw on these open sources:

  • GBIFCC-BY 4.0occurrence records behind the range map, elevation, and record counts
  • iNaturalistCC0 / CC-BY / CC-BY-SAobservations, photos, and audio recordings
  • NatureServe ExplorerCC-BYthe state conservation rank
  • IUCN Red Listattributed factthe global conservation status
  • USGS NASpublic domainnative / introduced status
  • Natural Earthpublic domainthe relief basemap
  • USFSpublic domainnational-forest boundaries