Mammals of Massachusetts
The mammals most often spotted in Massachusetts, ranked by recent research-grade observations.
121,727
recent observations
50
species listed
50
mammals
Naturalists have logged 121,727 research-grade observations across the 50 most-recorded species in Massachusetts. The most frequently seen is the Eastern Gray Squirrel, with 24,732 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
24,732 observations
Eastern Cottontail
Sylvilagus floridanus
19,106 observations
White-tailed Deer
Odocoileus virginianus
15,491 observations
Eastern Chipmunk
Tamias striatus
9,204 observations
Common Raccoon
Procyon lotor
5,193 observations
Coyote
Canis latrans
4,681 observations
American Beaver
Castor canadensis
4,166 observations
Red Fox
Vulpes vulpes
3,627 observations
American Red Squirrel
Tamiasciurus hudsonicus
3,362 observations
Groundhog
Marmota monax
3,203 observations
Bobcat
Lynx rufus
2,540 observations
Humpback Whale
Megaptera novaeangliae
2,415 observations
Grey Seal
Halichoerus grypus
2,380 observations
American Black Bear
Ursus americanus
2,167 observations
Virginia Opossum
Didelphis virginiana
2,163 observations
Muskrat
Ondatra zibethicus
1,985 observations
Striped Skunk
Mephitis mephitis
1,613 observations
North American Porcupine
Erethizon dorsatum
1,583 observations
Northern Short-tailed Shrew
Blarina brevicauda
1,124 observations
Harbor Seal
Phoca vitulina
1,116 observations
White-footed Mouse
Peromyscus leucopus
884 observations
Fisher
Pekania pennanti
874 observations
North American River Otter
Lontra canadensis
855 observations
Brown Rat
Rattus norvegicus
814 observations
Gray Fox
Urocyon cinereoargenteus
803 observations
American Mink
Neogale vison
634 observations
Eastern Meadow Vole
Microtus pennsylvanicus
579 observations
Moose
Alces alces
557 observations
Domestic Cat
Felis catus
510 observations
Big Brown Bat
Eptesicus fuscus
392 observations
Fin Whale
Balaenoptera physalus
336 observations
Southern Flying Squirrel
Glaucomys volans
291 observations
Atlantic White-sided Dolphin
Leucopleurus acutus
286 observations · iNaturalist
Long-tailed Weasel
Neogale frenata
251 observations · iNaturalist
American Ermine
Mustela richardsonii
223 observations
Common Dolphin
Delphinus delphis
204 observations
North Atlantic Right Whale
Eubalaena glacialis
199 observations
House Mouse
Mus musculus
195 observations
Common Minke Whale
Balaenoptera acutorostrata
152 observations
Hairy-tailed Mole
Parascalops breweri
133 observations
Star-nosed Mole
Condylura cristata
113 observations
Eastern Red Bat
Lasiurus borealis
96 observations
Masked Shrew
Sorex cinereus
88 observations
Harp Seal
Pagophilus groenlandicus
77 observations
Northern Meadow Jumping Mouse
Zapus hudsonius
69 observations
Harbour Porpoise
Phocoena phocoena
61 observations
Eastern Mole
Scalopus aquaticus
56 observations
Woodland Vole
Microtus pinetorum
53 observations
Southern Red-backed Vole
Clethrionomys gapperi
47 observations · iNaturalist
Snowshoe Hare
Lepus americanus
44 observations
Mammals in nearby places
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