Mammals of Colorado
The mammals most often spotted in Colorado, ranked by recent research-grade observations.
Most-observed mammals in Colorado
Mule Deer
Odocoileus hemionus
15,703 observations
Elk
Cervus canadensis
8,115 observations
Common Golden-mantled Ground Squirrel
Callospermophilus lateralis
6,451 observations
Eastern Fox Squirrel
Sciurus niger
6,195 observations
Black-tailed Prairie Dog
Cynomys ludovicianus
6,162 observations
Yellow-bellied Marmot
Marmota flaviventris
5,681 observations
Moose
Alces alces
5,323 observations
Bighorn Sheep
Ovis canadensis
4,275 observations
American Pika
Ochotona princeps
3,012 observations
Pronghorn
Antilocapra americana
2,752 observations
Coyote
Canis latrans
2,719 observations
Red Fox
Vulpes vulpes
2,426 observations
White-tailed Deer
Odocoileus virginianus
2,074 observations
American Black Bear
Ursus americanus
1,799 observations
Common Raccoon
Procyon lotor
1,550 observations
American Beaver
Castor canadensis
1,486 observations
Mountain Goat
Oreamnos americanus
1,393 observations
Muskrat
Ondatra zibethicus
1,286 observations
Fremont's Squirrel
Tamiasciurus fremonti
1,218 observations · iNaturalist
Wyoming Ground Squirrel
Urocitellus elegans
1,182 observations
Abert's Squirrel
Sciurus aberti
959 observations
Desert Cottontail
Sylvilagus audubonii
946 observations
Least Chipmunk
Neotamias minimus
827 observations
Bobcat
Lynx rufus
793 observations
Rock Squirrel
Otospermophilus variegatus
758 observations
Mountain Cottontail
Sylvilagus nuttallii
745 observations
Snowshoe Hare
Lepus americanus
477 observations
North American Porcupine
Erethizon dorsatum
477 observations
White-tailed Prairie Dog
Cynomys leucurus
410 observations
Gunnison's Prairie Dog
Cynomys gunnisoni
396 observations
Long-tailed Weasel
Neogale frenata
381 observations · iNaturalist
Mountain Lion
Puma concolor
348 observations
Striped Skunk
Mephitis mephitis
346 observations
Pacific Marten
Martes caurina
339 observations · iNaturalist
Black-tailed Jackrabbit
Lepus californicus
328 observations
American Mink
Neogale vison
320 observations
American Red Squirrel
Tamiasciurus hudsonicus
293 observations
American Badger
Taxidea taxus
284 observations
American Bison
Bison bison
280 observations
Thirteen-lined Ground Squirrel
Ictidomys tridecemlineatus
236 observations
Domestic Horse
Equus caballus
234 observations · iNaturalist
Colorado Chipmunk
Neotamias quadrivittatus
217 observations
Eastern Cottontail
Sylvilagus floridanus
214 observations
Swift Fox
Vulpes velox
165 observations
Domestic Cat
Felis catus
165 observations
Gray Fox
Urocyon cinereoargenteus
156 observations
White-tailed Jackrabbit
Lepus townsendii
147 observations
Western Deer Mouse
Peromyscus sonoriensis
108 observations · iNaturalist
North American River Otter
Lontra canadensis
102 observations
House Mouse
Mus musculus
93 observations