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Eastern Gray Squirrel
Sciurus carolinensis
12,978 observations
White-tailed Deer
Odocoileus virginianus
9,057 observations
Eastern Cottontail
Sylvilagus floridanus
7,720 observations
Eastern Chipmunk
Tamias striatus
4,043 observations
Common Raccoon
Procyon lotor
3,483 observations
Eastern Fox Squirrel
Sciurus niger
3,252 observations
Coyote
Canis latrans
2,132 observations
Virginia Opossum
Didelphis virginiana
2,054 observations
Muskrat
Ondatra zibethicus
1,830 observations
American Beaver
Castor canadensis
1,401 observations
Groundhog
Marmota monax
1,283 observations
Domestic Cat
Felis catus
878 observations
Red Fox
Vulpes vulpes
875 observations
Striped Skunk
Mephitis mephitis
645 observations
Northern Short-tailed Shrew
Blarina brevicauda
557 observations
American Mink
Neogale vison
457 observations
Thirteen-lined Ground Squirrel
Ictidomys tridecemlineatus
443 observations
Brown Rat
Rattus norvegicus
305 observations
Mexican Long-nosed Armadillo
Dasypus mexicanus
284 observations
Eastern Red Bat
Lasiurus borealis
262 observations
Silver-haired Bat
Lasionycteris noctivagans
218 observations
Big Brown Bat
Eptesicus fuscus
199 observations
Eastern Mole
Scalopus aquaticus
183 observations
Southern Flying Squirrel
Glaucomys volans
151 observations
Bobcat
Lynx rufus
127 observations
Western Meadow Vole
Microtus drummondii
127 observations
North American River Otter
Lontra canadensis
106 observations
House Mouse
Mus musculus
103 observations
Plains Pocket Gopher
Geomys bursarius
101 observations
White-footed Mouse
Peromyscus leucopus
95 observations
American Red Squirrel
Tamiasciurus hudsonicus
71 observations
Masked Shrew
Sorex cinereus
66 observations
Eastern Deermouse
Peromyscus maniculatus
63 observations
Northern Hoary Bat
Lasiurus cinereus
47 observations
Tricolored Bat
Perimyotis subflavus
44 observations
American Badger
Taxidea taxus
43 observations
Domestic Dog
Canis familiaris
35 observations
Northern Meadow Jumping Mouse
Zapus hudsonius
33 observations
Long-tailed Weasel
Neogale frenata
29 observations
American Ermine
Mustela richardsonii
20 observations
Least Weasel
Mustela nivalis
18 observations
Prairie Vole
Microtus ochrogaster
15 observations
European Rabbit
Oryctolagus cuniculus
13 observations
Woodland Vole
Microtus pinetorum
13 observations
North American Least Shrew
Cryptotis parvus
10 observations
Gray Fox
Urocyon cinereoargenteus
9 observations
Sika Deer
Cervus nippon
9 observations
Swamp Rabbit
Sylvilagus aquaticus
9 observations
Evening Bat
Nycticeius humeralis
8 observations
Southern Short-tailed Shrew
Blarina carolinensis
7 observations
Frequently Asked Questions
- The 10 most common mammals in Illinois are:
- Eastern Gray Squirrel (Sciurus carolinensis)
- White-tailed Deer (Odocoileus virginianus)
- Eastern Cottontail (Sylvilagus floridanus)
- Eastern Chipmunk (Tamias striatus)
- Common Raccoon (Procyon lotor)
- Eastern Fox Squirrel (Sciurus niger)
- Coyote (Canis latrans)
- Virginia Opossum (Didelphis virginiana)
- Muskrat (Ondatra zibethicus)
- American Beaver (Castor canadensis)
- The most observed mammal in Illinois is Eastern Gray Squirrel (Sciurus carolinensis), with 12,978 recorded observations.