Mammals of Massachusetts
The mammals most often spotted in Massachusetts, ranked by recent research-grade observations.
118,642
recent observations
50
species listed
50
mammals
Naturalists have logged 118,642 research-grade observations across the 50 most-recorded species in Massachusetts. The most frequently seen is the Eastern Gray Squirrel, with 24,348 recorded sightings.
Rarer finds confirmed in Massachusetts include Bobcat, Fisher and North Atlantic Right Whale - uncommon enough that a sighting is worth logging.
Most-observed mammals in Massachusetts
Eastern Gray Squirrel
Sciurus carolinensis
24,348 observations
Eastern Cottontail
Sylvilagus floridanus
18,598 observations
White-tailed Deer
Odocoileus virginianus
14,958 observations
Eastern Chipmunk
Tamias striatus
8,992 observations
Common Raccoon
Procyon lotor
5,053 observations
Coyote
Canis latrans
4,562 observations
American Beaver
Castor canadensis
4,081 observations
Red Fox
Vulpes vulpes
3,561 observations
American Red Squirrel
Tamiasciurus hudsonicus
3,299 observations
Groundhog
Marmota monax
3,098 observations
Bobcat
Lynx rufus
2,482 observations
Grey Seal
Halichoerus grypus
2,258 observations
Humpback Whale
Megaptera novaeangliae
2,233 observations
Virginia Opossum
Didelphis virginiana
2,112 observations
American Black Bear
Ursus americanus
2,084 observations
Muskrat
Ondatra zibethicus
1,976 observations
Striped Skunk
Mephitis mephitis
1,554 observations
North American Porcupine
Erethizon dorsatum
1,518 observations
Harbor Seal
Phoca vitulina
1,102 observations
Northern Short-tailed Shrew
Blarina brevicauda
1,096 observations
White-footed Mouse
Peromyscus leucopus
875 observations
Fisher
Pekania pennanti
860 observations
North American River Otter
Lontra canadensis
837 observations
Brown Rat
Rattus norvegicus
796 observations
Gray Fox
Urocyon cinereoargenteus
792 observations
American Mink
Neogale vison
623 observations
Eastern Meadow Vole
Microtus pennsylvanicus
566 observations
Moose
Alces alces
554 observations
Domestic Cat
Felis catus
491 observations
Big Brown Bat
Eptesicus fuscus
387 observations
Fin Whale
Balaenoptera physalus
332 observations
Southern Flying Squirrel
Glaucomys volans
287 observations
Atlantic White-sided Dolphin
Leucopleurus acutus
271 observations · iNaturalist
Long-tailed Weasel
Neogale frenata
240 observations · iNaturalist
American Ermine
Mustela richardsonii
214 observations · iNaturalist
Common Dolphin
Delphinus delphis
201 observations
North Atlantic Right Whale
Eubalaena glacialis
199 observations
House Mouse
Mus musculus
194 observations
Common Minke Whale
Balaenoptera acutorostrata
148 observations
Hairy-tailed Mole
Parascalops breweri
130 observations
Star-nosed Mole
Condylura cristata
111 observations
Eastern Red Bat
Lasiurus borealis
88 observations
Masked Shrew
Sorex cinereus
86 observations
Harp Seal
Pagophilus groenlandicus
76 observations · iNaturalist
Northern Meadow Jumping Mouse
Zapus hudsonius
65 observations
Harbour Porpoise
Phocoena phocoena
60 observations
Woodland Vole
Microtus pinetorum
53 observations
Eastern Mole
Scalopus aquaticus
53 observations
Snowshoe Hare
Lepus americanus
44 observations
Southern Red-backed Vole
Clethrionomys gapperi
44 observations · iNaturalist
Mammals in nearby places
Out spotting mammals in Massachusetts?
Take Huck with you. Identify any mammal you find in seconds and build your collection.
Get HuckLove mammals? Get Huck field notes
Spotting tips, new species, and the best of what people are finding in the wild - straight to your inbox.