Mammals of Pennsylvania
The mammals most often spotted in Pennsylvania, ranked by recent research-grade observations.
101,602
recent observations
50
species listed
50
mammals
Naturalists have logged 101,602 research-grade observations across the 50 most-recorded species in Pennsylvania. The most frequently seen is the White-tailed Deer, with 25,429 recorded sightings.
Rarer finds confirmed in Pennsylvania include Bobcat and Fisher - uncommon enough that a sighting is worth logging.
Most-observed mammals in Pennsylvania
White-tailed Deer
Odocoileus virginianus
25,429 observations
Eastern Gray Squirrel
Sciurus carolinensis
17,331 observations
Eastern Cottontail
Sylvilagus floridanus
10,478 observations
Eastern Chipmunk
Tamias striatus
7,892 observations
Groundhog
Marmota monax
6,238 observations
Red Fox
Vulpes vulpes
4,742 observations
Common Raccoon
Procyon lotor
4,716 observations
American Beaver
Castor canadensis
2,881 observations
American Red Squirrel
Tamiasciurus hudsonicus
2,307 observations
Domestic Cat
Felis catus
2,028 observations
American Black Bear
Ursus americanus
1,836 observations
Virginia Opossum
Didelphis virginiana
1,737 observations
Northern Short-tailed Shrew
Blarina brevicauda
1,732 observations
North American Porcupine
Erethizon dorsatum
1,541 observations
Striped Skunk
Mephitis mephitis
1,207 observations
Eastern Fox Squirrel
Sciurus niger
1,115 observations
Muskrat
Ondatra zibethicus
1,062 observations
Coyote
Canis latrans
942 observations
American Mink
Neogale vison
914 observations
Big Brown Bat
Eptesicus fuscus
598 observations
Wapiti
Cervus canadensis
563 observations
Gray Fox
Urocyon cinereoargenteus
416 observations
White-footed Mouse
Peromyscus leucopus
413 observations
Eastern Meadow Vole
Microtus pennsylvanicus
406 observations
Bobcat
Lynx rufus
353 observations
Fisher
Pekania pennanti
353 observations
Brown Rat
Rattus norvegicus
328 observations
Southern Flying Squirrel
Glaucomys volans
307 observations
Eastern Red Bat
Lasiurus borealis
233 observations
House Mouse
Mus musculus
210 observations
North American River Otter
Lontra canadensis
206 observations
Star-nosed Mole
Condylura cristata
175 observations
Hairy-tailed Mole
Parascalops breweri
150 observations
Eastern Deermouse
Peromyscus maniculatus
85 observations
Masked Shrew
Sorex cinereus
75 observations
Northern Meadow Jumping Mouse
Zapus hudsonius
68 observations
Long-tailed Weasel
Neogale frenata
65 observations · iNaturalist
Silver-haired Bat
Lasionycteris noctivagans
63 observations
Eastern Mole
Scalopus aquaticus
60 observations
American Ermine
Mustela richardsonii
49 observations
Tri-coloured Bat
Perimyotis subflavus
46 observations
Southern Red-backed Vole
Clethrionomys gapperi
45 observations · iNaturalist
Eastern Woodland Jumping Mouse
Napaeozapus insignis
35 observations
Woodland Vole
Microtus pinetorum
34 observations
Domestic Dog
Canis familiaris
33 observations · iNaturalist
European Rabbit
Oryctolagus cuniculus
27 observations · iNaturalist
Little Brown Bat
Myotis lucifugus
26 observations
Northern Flying Squirrel
Glaucomys sabrinus
20 observations
Northern Hoary Bat
Lasiurus cinereus
17 observations
Allegheny Woodrat
Neotoma magister
15 observations · iNaturalist
Mammals in nearby places
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