Mammals of Illinois
The mammals most often spotted in Illinois, ranked by recent research-grade observations.
75,567
recent observations
50
species listed
50
mammals
Naturalists have logged 75,567 research-grade observations across the 50 most-recorded species in Illinois. The most frequently seen is the Eastern Gray Squirrel, with 16,484 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
16,484 observations
White-tailed Deer
Odocoileus virginianus
13,569 observations
Eastern Cottontail
Sylvilagus floridanus
10,219 observations
Common Raccoon
Procyon lotor
5,436 observations
Eastern Chipmunk
Tamias striatus
5,253 observations
Eastern Fox Squirrel
Sciurus niger
3,910 observations
Virginia Opossum
Didelphis virginiana
2,829 observations
Coyote
Canis latrans
2,770 observations
Muskrat
Ondatra zibethicus
2,155 observations
Groundhog
Marmota monax
2,097 observations
American Beaver
Castor canadensis
1,708 observations
Red Fox
Vulpes vulpes
1,173 observations
Domestic Cat
Felis catus
1,040 observations
Striped Skunk
Mephitis mephitis
884 observations
Northern Short-tailed Shrew
Blarina brevicauda
649 observations
Mexican Long-nosed Armadillo
Dasypus mexicanus
619 observations
American Mink
Neogale vison
581 observations
Thirteen-lined Ground Squirrel
Ictidomys tridecemlineatus
541 observations
Eastern Red Bat
Lasiurus borealis
395 observations
Brown Rat
Rattus norvegicus
359 observations
Big Brown Bat
Eptesicus fuscus
315 observations
Eastern Mole
Scalopus aquaticus
309 observations
Silver-haired Bat
Lasionycteris noctivagans
253 observations
Bobcat
Lynx rufus
223 observations
Southern Flying Squirrel
Glaucomys volans
192 observations
North American River Otter
Lontra canadensis
168 observations
Western Meadow Vole
Microtus drummondii
137 observations
House Mouse
Mus musculus
132 observations
American Bison
Bos bison
128 observations · iNaturalist
White-footed Mouse
Peromyscus leucopus
121 observations
Plains Pocket Gopher
Geomys bursarius
114 observations
Tri-coloured Bat
Perimyotis subflavus
99 observations
American Red Squirrel
Tamiasciurus hudsonicus
79 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
43 observations · iNaturalist
Long-tailed Weasel
Neogale frenata
39 observations · iNaturalist
Northern Meadow Jumping Mouse
Zapus hudsonius
38 observations
Woodland Vole
Microtus pinetorum
38 observations
Wapiti
Cervus canadensis
37 observations
Gray Fox
Urocyon cinereoargenteus
31 observations
Domestic Horse
Equus caballus
29 observations · iNaturalist
American Ermine
Mustela richardsonii
25 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
North American Least Shrew
Cryptotis parvus
17 observations · iNaturalist
Mammals in nearby places
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