Mammals of Massachusetts
The mammals most often spotted in Massachusetts, ranked by recent research-grade observations.
Most-observed mammals in Massachusetts
Eastern Gray Squirrel
Sciurus carolinensis
23,942 observations
Eastern Cottontail
Sylvilagus floridanus
17,823 observations
White-tailed Deer
Odocoileus virginianus
14,220 observations
Eastern Chipmunk
Tamias striatus
8,662 observations
Common Raccoon
Procyon lotor
4,897 observations
Coyote
Canis latrans
4,438 observations
American Beaver
Castor canadensis
3,996 observations
Red Fox
Vulpes vulpes
3,466 observations
American Red Squirrel
Tamiasciurus hudsonicus
3,212 observations
Groundhog
Marmota monax
2,948 observations
Bobcat
Lynx rufus
2,426 observations
Grey Seal
Halichoerus grypus
2,166 observations
Virginia Opossum
Didelphis virginiana
2,059 observations
American Black Bear
Ursus americanus
1,989 observations
Humpback Whale
Megaptera novaeangliae
1,958 observations
Muskrat
Ondatra zibethicus
1,941 observations
Striped Skunk
Mephitis mephitis
1,477 observations
North American Porcupine
Erethizon dorsatum
1,414 observations
Harbor Seal
Phoca vitulina
1,092 observations
Northern Short-tailed Shrew
Blarina brevicauda
1,084 observations
White-footed Mouse
Peromyscus leucopus
854 observations
Fisher
Pekania pennanti
845 observations
North American River Otter
Lontra canadensis
809 observations
Brown Rat
Rattus norvegicus
773 observations
Gray Fox
Urocyon cinereoargenteus
735 observations
American Mink
Neogale vison
597 observations
Eastern Meadow Vole
Microtus pennsylvanicus
550 observations
Moose
Alces alces
533 observations
Domestic Cat
Felis catus
481 observations
Big Brown Bat
Eptesicus fuscus
383 observations
Fin Whale
Balaenoptera physalus
323 observations
Southern Flying Squirrel
Glaucomys volans
278 observations
Atlantic White-sided Dolphin
Leucopleurus acutus
255 observations · iNaturalist
Long-tailed Weasel
Neogale frenata
232 observations · iNaturalist
North Atlantic Right Whale
Eubalaena glacialis
199 observations
American Ermine
Mustela richardsonii
199 observations · iNaturalist
Common Dolphin
Delphinus delphis
195 observations
House Mouse
Mus musculus
192 observations
Common Minke Whale
Balaenoptera acutorostrata
141 observations
Hairy-tailed Mole
Parascalops breweri
128 observations
Star-nosed Mole
Condylura cristata
108 observations
Eastern Red Bat
Lasiurus borealis
84 observations
Masked Shrew
Sorex cinereus
82 observations
Harp Seal
Pagophilus groenlandicus
74 observations · iNaturalist
Northern Meadow Jumping Mouse
Zapus hudsonius
65 observations
Harbour Porpoise
Phocoena phocoena
58 observations
Eastern Mole
Scalopus aquaticus
53 observations
Woodland Vole
Microtus pinetorum
45 observations
Snowshoe Hare
Lepus americanus
44 observations
Southern Red-backed Vole
Clethrionomys gapperi
42 observations · iNaturalist