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Eastern Gray Squirrel
Sciurus carolinensis
14,803 observations
White-tailed Deer
Odocoileus virginianus
10,567 observations
Eastern Cottontail
Sylvilagus floridanus
9,318 observations
Eastern Chipmunk
Tamias striatus
4,922 observations
Common Raccoon
Procyon lotor
4,305 observations
Eastern Fox Squirrel
Sciurus niger
3,740 observations
Coyote
Canis latrans
2,473 observations
Virginia Opossum
Didelphis virginiana
2,377 observations
Muskrat
Ondatra zibethicus
2,010 observations
Groundhog
Marmota monax
1,578 observations
American Beaver
Castor canadensis
1,535 observations
Red Fox
Vulpes vulpes
993 observations
Domestic Cat
Felis catus
992 observations
Striped Skunk
Mephitis mephitis
791 observations
Northern Short-tailed Shrew
Blarina brevicauda
614 observations
Thirteen-lined Ground Squirrel
Ictidomys tridecemlineatus
572 observations
American Mink
Neogale vison
509 observations
Brown Rat
Rattus norvegicus
365 observations
Mexican Long-nosed Armadillo
Dasypus mexicanus
318 observations
Eastern Red Bat
Lasiurus borealis
315 observations
Silver-haired Bat
Lasionycteris noctivagans
289 observations
Big Brown Bat
Eptesicus fuscus
216 observations
Eastern Mole
Scalopus aquaticus
206 observations
Southern Flying Squirrel
Glaucomys volans
175 observations
Bobcat
Lynx rufus
143 observations
Western Meadow Vole
Microtus drummondii
136 observations
House Mouse
Mus musculus
118 observations
North American River Otter
Lontra canadensis
116 observations
American Bison
Bos bison
112 observations
Plains Pocket Gopher
Geomys bursarius
107 observations
White-footed Mouse
Peromyscus leucopus
106 observations
American Red Squirrel
Tamiasciurus hudsonicus
85 observations
Masked Shrew
Sorex cinereus
76 observations
Northern Hoary Bat
Lasiurus cinereus
46 observations
American Badger
Taxidea taxus
46 observations
Tri-coloured Bat
Perimyotis subflavus
45 observations
Long-tailed Weasel
Neogale frenata
39 observations
Northern Meadow Jumping Mouse
Zapus hudsonius
37 observations
Domestic Dog
Canis familiaris
37 observations
Woodland Vole
Microtus pinetorum
27 observations
American Ermine
Mustela richardsonii
25 observations
Least Weasel
Mustela nivalis
18 observations
European Rabbit
Oryctolagus cuniculus
15 observations
Prairie Vole
Microtus ochrogaster
15 observations
Swamp Rabbit
Sylvilagus aquaticus
11 observations
Gray Fox
Urocyon cinereoargenteus
10 observations
North American Least Shrew
Cryptotis parvus
10 observations
Little Brown Bat
Myotis lucifugus
9 observations
Wild Boar
Sus scrofa
9 observations
Evening Bat
Nycticeius humeralis
8 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)
- Groundhog (Marmota monax)
- The most observed mammal in Illinois is Eastern Gray Squirrel (Sciurus carolinensis), with 14,803 recorded observations.