Mammals of Pennsylvania
The mammals most often spotted in Pennsylvania, ranked by recent research-grade observations.
103,581
recent observations
50
species listed
50
mammals
Naturalists have logged 103,581 research-grade observations across the 50 most-recorded species in Pennsylvania. The most frequently seen is the White-tailed Deer, with 26,021 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
26,021 observations
Eastern Gray Squirrel
Sciurus carolinensis
17,732 observations
Eastern Cottontail
Sylvilagus floridanus
10,631 observations
Eastern Chipmunk
Tamias striatus
8,080 observations
Groundhog
Marmota monax
6,388 observations
Red Fox
Vulpes vulpes
4,791 observations
Common Raccoon
Procyon lotor
4,774 observations
American Beaver
Castor canadensis
2,914 observations
American Red Squirrel
Tamiasciurus hudsonicus
2,349 observations
Domestic Cat
Felis catus
2,060 observations
American Black Bear
Ursus americanus
1,866 observations
Northern Short-tailed Shrew
Blarina brevicauda
1,771 observations
Virginia Opossum
Didelphis virginiana
1,759 observations
North American Porcupine
Erethizon dorsatum
1,566 observations
Striped Skunk
Mephitis mephitis
1,230 observations
Eastern Fox Squirrel
Sciurus niger
1,137 observations
Muskrat
Ondatra zibethicus
1,067 observations
Coyote
Canis latrans
957 observations
American Mink
Neogale vison
927 observations
Big Brown Bat
Eptesicus fuscus
601 observations
Wapiti
Cervus canadensis
575 observations
White-footed Mouse
Peromyscus leucopus
423 observations
Gray Fox
Urocyon cinereoargenteus
421 observations
Eastern Meadow Vole
Microtus pennsylvanicus
417 observations
Bobcat
Lynx rufus
359 observations
Fisher
Pekania pennanti
355 observations
Brown Rat
Rattus norvegicus
334 observations
Southern Flying Squirrel
Glaucomys volans
310 observations
Eastern Red Bat
Lasiurus borealis
236 observations
House Mouse
Mus musculus
217 observations
North American River Otter
Lontra canadensis
208 observations
Star-nosed Mole
Condylura cristata
175 observations
Hairy-tailed Mole
Parascalops breweri
151 observations
Eastern Deermouse
Peromyscus maniculatus
85 observations
Masked Shrew
Sorex cinereus
76 observations
Northern Meadow Jumping Mouse
Zapus hudsonius
68 observations
Silver-haired Bat
Lasionycteris noctivagans
66 observations
Long-tailed Weasel
Neogale frenata
65 observations · iNaturalist
Eastern Mole
Scalopus aquaticus
60 observations
American Ermine
Mustela richardsonii
50 observations
Tri-coloured Bat
Perimyotis subflavus
47 observations
Southern Red-backed Vole
Clethrionomys gapperi
45 observations · iNaturalist
Eastern Woodland Jumping Mouse
Napaeozapus insignis
35 observations
Woodland Vole
Microtus pinetorum
35 observations
Domestic Dog
Canis familiaris
34 observations · iNaturalist
Little Brown Bat
Myotis lucifugus
31 observations
European Rabbit
Oryctolagus cuniculus
29 observations · iNaturalist
Northern Flying Squirrel
Glaucomys sabrinus
20 observations
Northern Hoary Bat
Lasiurus cinereus
18 observations
Snowshoe Hare
Lepus americanus
15 observations
Mammals in nearby places
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