Pennsylvania mammals

Northern Short-tailed Shrew in Pennsylvania

Blarina brevicauda

Native to Pennsylvania S5 Secure in Pennsylvania

Not listed as nonindigenous in Pennsylvania by USGS NAS; native to its Pennsylvania 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 Short-tailed Shrew in Pennsylvania, by the numbers

Common in Pennsylvania 12th most recorded of 73 mammals logged in Pennsylvania

1,285 occurrence records
1,260 with iNaturalist photos

Records from 2000–2026.

1,285 total records count every Pennsylvania occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 300; the monthly chart covers the 1,233 records with a full observation date.

When to look for the Northern Short-tailed Shrew in Pennsylvania

Most sightings fall in August to October.

1,233 Pennsylvania occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly Pennsylvania records (table)
MonthRecords
January23
February30
March39
April112
May148
June118
July122
August129
September185
October210
November82
December35

Monthly northern short-tailed shrew occurrence records (iNaturalist and GBIF) in Pennsylvania, 2000–2026.

Seasonality

Year-round in Pennsylvania, with recorded sightings peaking in August–October, with a smaller rise in May.

Occurrence map

Where Northern Short-tailed Shrew has been recorded in Pennsylvania

300 records mapped · zoom and drag to explore

299 Pennsylvania records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Yellow Creek State Park 9
Tyler State Park 8
Valley Forge National Historical Park 7
State Game Land #46 7
Presque Isle State Park 4
French Creek State Park 4
Nockamixpm State Park 4
Ridley Creek State Park 4

Protected places with the most northern short-tailed shrew 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 Pennsylvania

CountyRecords
Montgomery County 162
Allegheny County 139
Chester County 102
Philadelphia County 94
Bucks County 78
Delaware County 59
Centre County 43
Berks County 40
Lancaster County 35
Westmoreland County 29
York County 28
Northampton County 26
52 other counties 450

The complete county distribution, spread across 64 Pennsylvania counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

The northern short-tailed shrew is well represented in Pennsylvania records despite spending most of its life hidden beneath leaves, logs, and soil. Deep ground cover in Allegheny National Forest, moist ravines at Ricketts Glen, and shaded slopes in Delaware Water Gap all provide the concealed forest floor where this native shrew is detected.

No single reporting peak stands out across the 843 occurrence records. Elevation, moisture, and local searching effort all change the chance of finding such a hidden animal, so sparse surface sightings should not be treated as absence for this secure S5 species.

Occurrence data from iNaturalist and GBIF.

More mammals in Pennsylvania 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"