Mammals of Illinois
The mammals most often spotted in Illinois, ranked by recent research-grade observations.
Most-observed mammals in Illinois
Eastern Gray Squirrel
Sciurus carolinensis
16,018 observations
White-tailed Deer
Odocoileus virginianus
12,913 observations
Eastern Cottontail
Sylvilagus floridanus
9,604 observations
Common Raccoon
Procyon lotor
5,223 observations
Eastern Chipmunk
Tamias striatus
4,998 observations
Eastern Fox Squirrel
Sciurus niger
3,815 observations
Virginia Opossum
Didelphis virginiana
2,755 observations
Coyote
Canis latrans
2,668 observations
Muskrat
Ondatra zibethicus
2,117 observations
Groundhog
Marmota monax
1,984 observations
American Beaver
Castor canadensis
1,661 observations
Red Fox
Vulpes vulpes
1,135 observations
Domestic Cat
Felis catus
1,012 observations
Striped Skunk
Mephitis mephitis
839 observations
Northern Short-tailed Shrew
Blarina brevicauda
632 observations
Mexican Long-nosed Armadillo
Dasypus mexicanus
608 observations · iNaturalist
American Mink
Neogale vison
562 observations
Thirteen-lined Ground Squirrel
Ictidomys tridecemlineatus
496 observations
Eastern Red Bat
Lasiurus borealis
378 observations
Brown Rat
Rattus norvegicus
345 observations
Big Brown Bat
Eptesicus fuscus
311 observations
Eastern Mole
Scalopus aquaticus
295 observations
Silver-haired Bat
Lasionycteris noctivagans
246 observations
Bobcat
Lynx rufus
222 observations
Southern Flying Squirrel
Glaucomys volans
185 observations
North American River Otter
Lontra canadensis
162 observations
Western Meadow Vole
Microtus drummondii
137 observations · iNaturalist
House Mouse
Mus musculus
126 observations
White-footed Mouse
Peromyscus leucopus
119 observations
Plains Pocket Gopher
Geomys bursarius
114 observations
Tri-coloured Bat
Perimyotis subflavus
98 observations
Masked Shrew
Sorex cinereus
77 observations
American Red Squirrel
Tamiasciurus hudsonicus
75 observations
Eastern Deermouse
Peromyscus maniculatus
71 observations
Northern Hoary Bat
Lasiurus cinereus
50 observations
American Badger
Taxidea taxus
49 observations
Domestic Dog
Canis familiaris
43 observations · iNaturalist
Northern Meadow Jumping Mouse
Zapus hudsonius
37 observations
Elk
Cervus canadensis
37 observations
Long-tailed Weasel
Neogale frenata
35 observations · iNaturalist
Gray Fox
Urocyon cinereoargenteus
30 observations
Domestic Horse
Equus caballus
27 observations · iNaturalist
American Ermine
Mustela richardsonii
25 observations · iNaturalist
Woodland Vole
Microtus pinetorum
23 observations
Least Weasel
Mustela nivalis
21 observations
European Rabbit
Oryctolagus cuniculus
20 observations · iNaturalist
Wild Boar
Sus scrofa
18 observations · iNaturalist
Prairie Vole
Microtus ochrogaster
18 observations
American Black Bear
Ursus americanus
17 observations
North American Least Shrew
Cryptotis parvus
17 observations · iNaturalist