Mammals of Massachusetts
The mammals most often spotted in Massachusetts, ranked by recent research-grade observations.
119,872
recent observations
50
species listed
50
mammals
Naturalists have logged 119,872 research-grade observations across the 50 most-recorded species in Massachusetts. The most frequently seen is the Eastern Gray Squirrel, with 24,453 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
24,453 observations
Eastern Cottontail
Sylvilagus floridanus
18,821 observations
White-tailed Deer
Odocoileus virginianus
15,187 observations
Eastern Chipmunk
Tamias striatus
9,050 observations
Common Raccoon
Procyon lotor
5,110 observations
Coyote
Canis latrans
4,596 observations
American Beaver
Castor canadensis
4,142 observations
Red Fox
Vulpes vulpes
3,589 observations
American Red Squirrel
Tamiasciurus hudsonicus
3,320 observations
Groundhog
Marmota monax
3,148 observations
Bobcat
Lynx rufus
2,511 observations
Grey Seal
Halichoerus grypus
2,313 observations
Humpback Whale
Megaptera novaeangliae
2,295 observations
American Black Bear
Ursus americanus
2,128 observations
Virginia Opossum
Didelphis virginiana
2,126 observations
Muskrat
Ondatra zibethicus
1,980 observations
Striped Skunk
Mephitis mephitis
1,577 observations
North American Porcupine
Erethizon dorsatum
1,561 observations
Harbor Seal
Phoca vitulina
1,113 observations
Northern Short-tailed Shrew
Blarina brevicauda
1,100 observations
White-footed Mouse
Peromyscus leucopus
880 observations
Fisher
Pekania pennanti
863 observations
North American River Otter
Lontra canadensis
845 observations
Brown Rat
Rattus norvegicus
802 observations
Gray Fox
Urocyon cinereoargenteus
796 observations
American Mink
Neogale vison
630 observations
Eastern Meadow Vole
Microtus pennsylvanicus
571 observations
Moose
Alces alces
555 observations
Domestic Cat
Felis catus
499 observations
Big Brown Bat
Eptesicus fuscus
389 observations
Fin Whale
Balaenoptera physalus
334 observations
Southern Flying Squirrel
Glaucomys volans
288 observations
Atlantic White-sided Dolphin
Leucopleurus acutus
275 observations · iNaturalist
Long-tailed Weasel
Neogale frenata
243 observations · iNaturalist
American Ermine
Mustela richardsonii
217 observations
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
149 observations
Hairy-tailed Mole
Parascalops breweri
133 observations
Star-nosed Mole
Condylura cristata
111 observations
Eastern Red Bat
Lasiurus borealis
91 observations
Masked Shrew
Sorex cinereus
86 observations
Harp Seal
Pagophilus groenlandicus
77 observations
Northern Meadow Jumping Mouse
Zapus hudsonius
65 observations
Harbour Porpoise
Phocoena phocoena
61 observations
Eastern Mole
Scalopus aquaticus
55 observations
Woodland Vole
Microtus pinetorum
53 observations
Southern Red-backed Vole
Clethrionomys gapperi
46 observations · iNaturalist
Snowshoe Hare
Lepus americanus
44 observations
Mammals in nearby places
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