Mammals of Pennsylvania
The mammals most often spotted in Pennsylvania, ranked by recent research-grade observations.
Most-observed mammals in Pennsylvania
White-tailed Deer
Odocoileus virginianus
24,094 observations
Eastern Gray Squirrel
Sciurus carolinensis
16,760 observations
Eastern Cottontail
Sylvilagus floridanus
9,731 observations
Eastern Chipmunk
Tamias striatus
7,483 observations
Groundhog
Marmota monax
5,809 observations
Red Fox
Vulpes vulpes
4,602 observations
Common Raccoon
Procyon lotor
4,531 observations
American Beaver
Castor canadensis
2,743 observations
American Red Squirrel
Tamiasciurus hudsonicus
2,205 observations
Domestic Cat
Felis catus
1,957 observations
American Black Bear
Ursus americanus
1,727 observations
Virginia Opossum
Didelphis virginiana
1,697 observations
Northern Short-tailed Shrew
Blarina brevicauda
1,683 observations
North American Porcupine
Erethizon dorsatum
1,488 observations
Striped Skunk
Mephitis mephitis
1,136 observations
Eastern Fox Squirrel
Sciurus niger
1,054 observations
Muskrat
Ondatra zibethicus
1,028 observations
Coyote
Canis latrans
905 observations
American Mink
Neogale vison
869 observations
Elk
Cervus canadensis
549 observations
Big Brown Bat
Eptesicus fuscus
548 observations
Gray Fox
Urocyon cinereoargenteus
392 observations
White-footed Mouse
Peromyscus leucopus
386 observations
Eastern Meadow Vole
Microtus pennsylvanicus
385 observations
Bobcat
Lynx rufus
346 observations
Fisher
Pekania pennanti
340 observations
Brown Rat
Rattus norvegicus
318 observations
Southern Flying Squirrel
Glaucomys volans
293 observations
Eastern Red Bat
Lasiurus borealis
221 observations
House Mouse
Mus musculus
202 observations
North American River Otter
Lontra canadensis
194 observations
Star-nosed Mole
Condylura cristata
169 observations
Hairy-tailed Mole
Parascalops breweri
142 observations
Eastern Deermouse
Peromyscus maniculatus
86 observations
Masked Shrew
Sorex cinereus
72 observations
Northern Meadow Jumping Mouse
Zapus hudsonius
66 observations
Silver-haired Bat
Lasionycteris noctivagans
63 observations
Long-tailed Weasel
Neogale frenata
59 observations · iNaturalist
Eastern Mole
Scalopus aquaticus
58 observations
American Ermine
Mustela richardsonii
49 observations · iNaturalist
Tri-coloured Bat
Perimyotis subflavus
46 observations
Southern Red-backed Vole
Clethrionomys gapperi
44 observations · iNaturalist
Eastern Woodland Jumping Mouse
Napaeozapus insignis
35 observations
Domestic Dog
Canis familiaris
31 observations · iNaturalist
Woodland Vole
Microtus pinetorum
27 observations
European Rabbit
Oryctolagus cuniculus
26 observations · iNaturalist
Little Brown Bat
Myotis lucifugus
24 observations
Northern Flying Squirrel
Glaucomys sabrinus
20 observations
Northern Hoary Bat
Lasiurus cinereus
16 observations
Snowshoe Hare
Lepus americanus
14 observations