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 13th most recorded of 79 mammals logged in Pennsylvania

1,479 occurrence records
1,197 with iNaturalist photos

1,479 total records count every Pennsylvania occurrence from GBIF and iNaturalist; the map plots a georeferenced sample of 300; the monthly chart covers the 1,465 records with a full observation date.

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

Most sightings fall in August to October.

1,465 Pennsylvania occurrence records (iNaturalist and GBIF) by month of year. Shows when the species is recorded, not a guarantee of presence.

Monthly Pennsylvania records (table)
MonthRecords
January32
February35
March46
April121
May166
June134
July139
August158
September239
October230
November109
December56

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

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

300 Pennsylvania records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Yellow Creek State Park 9
Tyler State Park 8
Tobyhanna State Park 8
Valley Forge National Historical Park 6
State Game Land #46 6
State Game Land #214 6
Ridley Creek State Park 4
French 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 163
Allegheny County 134
Chester County 107
Philadelphia County 104
Bucks County 84
Westmoreland County 79
Delaware County 77
Cumberland County 61
Centre County 61
Berks County 49
Crawford County 48
Monroe County 38
52 other counties 474

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 1,113 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"