Nebraska mammals

Northern Grasshopper Mouse in Nebraska

Onychomys leucogaster

Native to Nebraska S5 Secure 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.

Northern Grasshopper Mouse in Nebraska, by the numbers

Rare in Nebraska 66th most recorded of 95 mammals logged in Nebraska

204 occurrence records
3 with iNaturalist photos
Sep 6, 2024 Last seen in Nebraska

Records from 2000–2026.

204 total records count every Nebraska occurrence from GBIF and iNaturalist; the monthly chart covers the 199 records with a full observation date.

When to look for the Northern Grasshopper Mouse in Nebraska

Most sightings fall in June.

199 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
January0
February0
March0
April3
May5
June71
July23
August28
September13
October32
November13
December11

Monthly northern grasshopper mouse occurrence records (iNaturalist and GBIF) in Nebraska, 2000–2026.

Seasonality

Year-round in Nebraska, with recorded sightings peaking in June.

Occurrence map

Where Northern Grasshopper Mouse has been recorded in Nebraska

204 records mapped · zoom and drag to explore

204 Nebraska records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Fort Niobrara National Wildlife Refuge_Wilderness Area 1

Protected places with the most northern grasshopper mouse sightings, from the USGS Protected Areas Database plus named mountain ranges, good spots to look, not a full breakdown, so they don't sum to the total.

Where it's recorded in Nebraska

CountyRecords
Cherry County 63
Garden County 22
Keith County 18
Antelope County 11
Sheridan County 11
Thomas County 9
Kimball County 8
Cheyenne County 8
Logan County 7
Dundy County 6
Dawes County 5
Cass County 5
18 other counties 31

The complete county distribution, spread across 30 Nebraska counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Northern grasshopper mice, unusual among rodents for being largely carnivorous, hunting insects and even other small mice, rack up 204 records in Nebraska, yet only 3 come from iNaturalist, an overwhelming GBIF trapping-survey signature rather than casual sightings of this genuinely widespread but rarely seen species. NatureServe rates the state population S5, secure.

June alone accounts for 71 of the year’s monthly-tallied records, more than a third of the total, a sharp spike that lines up far more closely with summer trapping-survey timing than with the mouse’s own year-round nocturnal activity.

Occurrence data from iNaturalist and 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
  • USGS Protected Areas Databasepublic domainthe named parks, forests, and refuges behind "notable places to look"