Mammals of Boston National Historical Park
The mammals most often spotted in Boston, ranked by recent research-grade observations.
Most-observed mammals in Boston
Eastern Gray Squirrel
Sciurus carolinensis
1,355 observations
Eastern Cottontail
Sylvilagus floridanus
358 observations
Brown Rat
Rattus norvegicus
53 observations
Harbor Seal
Phoca vitulina
12 observations
House Mouse
Mus musculus
11 observations
Eastern Chipmunk
Tamias striatus
5 observations
Common Raccoon
Procyon lotor
4 observations
Striped Skunk
Mephitis mephitis
4 observations
Humpback Whale
Megaptera novaeangliae
3 observations
White-tailed Deer
Odocoileus virginianus
3 observations
Domestic Cat
Felis catus
3 observations
Coyote
Canis latrans
2 observations
Muskrat
Ondatra zibethicus
2 observations
American Red Squirrel
Tamiasciurus hudsonicus
2 observations
Big Brown Bat
Eptesicus fuscus
1 observation
Eastern Red Bat
Lasiurus borealis
1 observation
Harbour Porpoise
Phocoena phocoena
1 observation
Grey Seal
Halichoerus grypus
1 observation
White-footed Mouse
Peromyscus leucopus
1 observation
Northern Short-tailed Shrew
Blarina brevicauda
1 observation
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