Mammals of Connecticut
The mammals most often spotted in Connecticut, ranked by recent research-grade observations.
25,158
recent observations
50
species listed
50
mammals
Naturalists have logged 25,158 research-grade observations across the 50 most-recorded species in Connecticut. The most frequently seen is the White-tailed Deer, with 4,203 recorded sightings.
Rarer finds confirmed in Connecticut include Bobcat and Fisher - uncommon enough that a sighting is worth logging.
Most-observed mammals in Connecticut
White-tailed Deer
Odocoileus virginianus
4,203 observations
Eastern Gray Squirrel
Sciurus carolinensis
3,820 observations
Eastern Cottontail
Sylvilagus floridanus
2,483 observations
Bobcat
Lynx rufus
1,739 observations
Eastern Chipmunk
Tamias striatus
1,680 observations
Red Fox
Vulpes vulpes
1,465 observations
Common Raccoon
Procyon lotor
1,273 observations
Coyote
Canis latrans
1,188 observations
American Black Bear
Ursus americanus
1,050 observations
Groundhog
Marmota monax
1,002 observations
Virginia Opossum
Didelphis virginiana
918 observations
American Beaver
Castor canadensis
726 observations
American Red Squirrel
Tamiasciurus hudsonicus
563 observations
Striped Skunk
Mephitis mephitis
391 observations
Northern Short-tailed Shrew
Blarina brevicauda
279 observations
Muskrat
Ondatra zibethicus
246 observations
White-footed Mouse
Peromyscus leucopus
190 observations
Domestic Cat
Felis catus
178 observations
North American Porcupine
Erethizon dorsatum
170 observations
American Mink
Neogale vison
162 observations
Harbor Seal
Phoca vitulina
147 observations
Gray Fox
Urocyon cinereoargenteus
146 observations
Grey Seal
Halichoerus grypus
132 observations
Big Brown Bat
Eptesicus fuscus
110 observations
North American River Otter
Lontra canadensis
108 observations
Eastern Meadow Vole
Microtus pennsylvanicus
106 observations
Southern Flying Squirrel
Glaucomys volans
100 observations
Brown Rat
Rattus norvegicus
99 observations
Eastern Mole
Scalopus aquaticus
57 observations
Moose
Alces alces
51 observations
Eastern Red Bat
Lasiurus borealis
46 observations
Long-tailed Weasel
Neogale frenata
44 observations · iNaturalist
Fisher
Pekania pennanti
42 observations
Masked Shrew
Sorex cinereus
32 observations
American Ermine
Mustela richardsonii
28 observations · iNaturalist
Star-nosed Mole
Condylura cristata
21 observations
Humpback Whale
Megaptera novaeangliae
20 observations
House Mouse
Mus musculus
18 observations
Tamanend's Bottlenose Dolphin
Tursiops erebennus
17 observations · iNaturalist
Woodland Vole
Microtus pinetorum
15 observations
Harp Seal
Pagophilus groenlandicus
14 observations · iNaturalist
Northern Meadow Jumping Mouse
Zapus hudsonius
13 observations
Hairy-tailed Mole
Parascalops breweri
13 observations
Fin Whale
Balaenoptera physalus
11 observations
Silver-haired Bat
Lasionycteris noctivagans
10 observations
Common Dolphin
Delphinus delphis
8 observations
Domestic Dog
Canis familiaris
8 observations · iNaturalist
Eastern Deermouse
Peromyscus maniculatus
6 observations
Eastern Woodland Jumping Mouse
Napaeozapus insignis
5 observations
Smoky Shrew
Sorex fumeus
5 observations
Mammals in nearby places
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