Mammals of Illinois
The mammals most often spotted in Illinois, ranked by recent research-grade observations.
77,104
recent observations
50
species listed
50
mammals
Naturalists have logged 77,104 research-grade observations across the 50 most-recorded species in Illinois. The most frequently seen is the Eastern Gray Squirrel, with 16,808 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
16,808 observations
White-tailed Deer
Odocoileus virginianus
13,781 observations
Eastern Cottontail
Sylvilagus floridanus
10,468 observations
Common Raccoon
Procyon lotor
5,514 observations
Eastern Chipmunk
Tamias striatus
5,408 observations
Eastern Fox Squirrel
Sciurus niger
4,001 observations
Virginia Opossum
Didelphis virginiana
2,863 observations
Coyote
Canis latrans
2,815 observations
Muskrat
Ondatra zibethicus
2,179 observations
Groundhog
Marmota monax
2,160 observations
American Beaver
Castor canadensis
1,720 observations
Red Fox
Vulpes vulpes
1,197 observations
Domestic Cat
Felis catus
1,079 observations
Striped Skunk
Mephitis mephitis
943 observations
Northern Short-tailed Shrew
Blarina brevicauda
658 observations
Mexican Long-nosed Armadillo
Dasypus mexicanus
628 observations
American Mink
Neogale vison
588 observations
Thirteen-lined Ground Squirrel
Ictidomys tridecemlineatus
560 observations
Eastern Red Bat
Lasiurus borealis
415 observations
Brown Rat
Rattus norvegicus
362 observations
Big Brown Bat
Eptesicus fuscus
321 observations
Eastern Mole
Scalopus aquaticus
310 observations
Silver-haired Bat
Lasionycteris noctivagans
278 observations
Bobcat
Lynx rufus
225 observations
Southern Flying Squirrel
Glaucomys volans
194 observations
North American River Otter
Lontra canadensis
169 observations
Western Meadow Vole
Microtus drummondii
138 observations
House Mouse
Mus musculus
136 observations
American Bison
Bos bison
131 observations · iNaturalist
White-footed Mouse
Peromyscus leucopus
123 observations
Plains Pocket Gopher
Geomys bursarius
116 observations
Tri-coloured Bat
Perimyotis subflavus
101 observations
American Red Squirrel
Tamiasciurus hudsonicus
80 observations
Masked Shrew
Sorex cinereus
79 observations
Eastern Deermouse
Peromyscus maniculatus
71 observations
Northern Hoary Bat
Lasiurus cinereus
50 observations
American Badger
Taxidea taxus
50 observations
Domestic Dog
Canis familiaris
46 observations · iNaturalist
Long-tailed Weasel
Neogale frenata
41 observations · iNaturalist
Northern Meadow Jumping Mouse
Zapus hudsonius
38 observations
Woodland Vole
Microtus pinetorum
38 observations
Wapiti
Cervus canadensis
38 observations
Gray Fox
Urocyon cinereoargenteus
32 observations
Domestic Horse
Equus caballus
30 observations · iNaturalist
American Ermine
Mustela richardsonii
26 observations
European Rabbit
Oryctolagus cuniculus
21 observations · iNaturalist
Least Weasel
Mustela nivalis
21 observations
Wild Boar
Sus scrofa
19 observations · iNaturalist
Prairie Vole
Microtus ochrogaster
18 observations
American Black Bear
Ursus americanus
17 observations
Mammals in nearby places
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