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Eastern Gray Squirrel
Sciurus carolinensis
13,607 observations
White-tailed Deer
Odocoileus virginianus
9,597 observations
Eastern Cottontail
Sylvilagus floridanus
8,305 observations
Eastern Chipmunk
Tamias striatus
4,444 observations
Common Raccoon
Procyon lotor
3,795 observations
Eastern Fox Squirrel
Sciurus niger
3,412 observations
Coyote
Canis latrans
2,278 observations
Virginia Opossum
Didelphis virginiana
2,146 observations
Muskrat
Ondatra zibethicus
1,935 observations
American Beaver
Castor canadensis
1,461 observations
Groundhog
Marmota monax
1,380 observations
Red Fox
Vulpes vulpes
917 observations
Domestic Cat
Felis catus
910 observations
Striped Skunk
Mephitis mephitis
670 observations
Northern Short-tailed Shrew
Blarina brevicauda
567 observations
Thirteen-lined Ground Squirrel
Ictidomys tridecemlineatus
485 observations
American Mink
Neogale vison
479 observations
Brown Rat
Rattus norvegicus
336 observations
Mexican Long-nosed Armadillo
Dasypus mexicanus
293 observations
Eastern Red Bat
Lasiurus borealis
269 observations
Silver-haired Bat
Lasionycteris noctivagans
232 observations
Big Brown Bat
Eptesicus fuscus
204 observations
Eastern Mole
Scalopus aquaticus
189 observations
Southern Flying Squirrel
Glaucomys volans
160 observations
Western Meadow Vole
Microtus drummondii
132 observations
Bobcat
Lynx rufus
130 observations
North American River Otter
Lontra canadensis
110 observations
House Mouse
Mus musculus
105 observations
Plains Pocket Gopher
Geomys bursarius
103 observations
White-footed Mouse
Peromyscus leucopus
99 observations
American Red Squirrel
Tamiasciurus hudsonicus
78 observations
Masked Shrew
Sorex cinereus
71 observations
Eastern Deermouse
Peromyscus maniculatus
65 observations
Northern Hoary Bat
Lasiurus cinereus
47 observations
American Badger
Taxidea taxus
44 observations
Tri-coloured Bat
Perimyotis subflavus
44 observations
Northern Meadow Jumping Mouse
Zapus hudsonius
35 observations
Domestic Dog
Canis familiaris
35 observations
Long-tailed Weasel
Neogale frenata
31 observations
American Ermine
Mustela richardsonii
22 observations
Least Weasel
Mustela nivalis
18 observations
Woodland Vole
Microtus pinetorum
16 observations
Prairie Vole
Microtus ochrogaster
15 observations
European Rabbit
Oryctolagus cuniculus
14 observations
American Bison
Bison bison
13 observations
Swamp Rabbit
Sylvilagus aquaticus
11 observations
North American Least Shrew
Cryptotis parvus
10 observations
Gray Fox
Urocyon cinereoargenteus
9 observations
Evening Bat
Nycticeius humeralis
8 observations
Little Brown Bat
Myotis lucifugus
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 13,607 recorded observations.