Mammals of Illinois
The mammals most often spotted in Illinois, ranked by recent research-grade observations.
74,612
recent observations
50
species listed
50
mammals
Naturalists have logged 74,612 research-grade observations across the 50 most-recorded species in Illinois. The most frequently seen is the Eastern Gray Squirrel, with 16,331 recorded sightings.
Rarer finds confirmed in Illinois include Bobcat - uncommon enough that a sighting is worth logging.
Most-observed mammals in Illinois
Eastern Gray Squirrel
Sciurus carolinensis
16,331 observations
White-tailed Deer
Odocoileus virginianus
13,367 observations
Eastern Cottontail
Sylvilagus floridanus
10,071 observations
Common Raccoon
Procyon lotor
5,395 observations
Eastern Chipmunk
Tamias striatus
5,190 observations
Eastern Fox Squirrel
Sciurus niger
3,867 observations
Virginia Opossum
Didelphis virginiana
2,818 observations
Coyote
Canis latrans
2,742 observations
Muskrat
Ondatra zibethicus
2,150 observations
Groundhog
Marmota monax
2,062 observations
American Beaver
Castor canadensis
1,682 observations
Red Fox
Vulpes vulpes
1,159 observations
Domestic Cat
Felis catus
1,038 observations
Striped Skunk
Mephitis mephitis
876 observations
Northern Short-tailed Shrew
Blarina brevicauda
637 observations
Mexican Long-nosed Armadillo
Dasypus mexicanus
617 observations · iNaturalist
American Mink
Neogale vison
576 observations
Thirteen-lined Ground Squirrel
Ictidomys tridecemlineatus
532 observations
Eastern Red Bat
Lasiurus borealis
388 observations
Brown Rat
Rattus norvegicus
356 observations
Big Brown Bat
Eptesicus fuscus
314 observations
Eastern Mole
Scalopus aquaticus
297 observations
Silver-haired Bat
Lasionycteris noctivagans
248 observations
Bobcat
Lynx rufus
222 observations
Southern Flying Squirrel
Glaucomys volans
190 observations
North American River Otter
Lontra canadensis
166 observations
Western Meadow Vole
Microtus drummondii
137 observations · iNaturalist
House Mouse
Mus musculus
130 observations
White-footed Mouse
Peromyscus leucopus
120 observations
Plains Pocket Gopher
Geomys bursarius
114 observations
Tri-coloured Bat
Perimyotis subflavus
99 observations
American Red Squirrel
Tamiasciurus hudsonicus
78 observations
Masked Shrew
Sorex cinereus
78 observations
Eastern Deermouse
Peromyscus maniculatus
71 observations
Northern Hoary Bat
Lasiurus cinereus
50 observations
American Badger
Taxidea taxus
50 observations
Domestic Dog
Canis familiaris
43 observations · iNaturalist
Wapiti
Cervus canadensis
38 observations
Long-tailed Weasel
Neogale frenata
38 observations · iNaturalist
Northern Meadow Jumping Mouse
Zapus hudsonius
37 observations
Woodland Vole
Microtus pinetorum
37 observations
Gray Fox
Urocyon cinereoargenteus
31 observations
Domestic Horse
Equus caballus
28 observations · iNaturalist
American Ermine
Mustela richardsonii
27 observations · iNaturalist
Least Weasel
Mustela nivalis
23 observations
European Rabbit
Oryctolagus cuniculus
21 observations · iNaturalist
Wild Boar
Sus scrofa
19 observations · iNaturalist
Prairie Vole
Microtus ochrogaster
18 observations
American Black Bear
Ursus americanus
17 observations
North American Least Shrew
Cryptotis parvus
17 observations · iNaturalist
Mammals in nearby places
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