Mammals of Yellowstone National Park
The mammals most often spotted in Yellowstone, ranked by recent research-grade observations.
Most-observed mammals in Yellowstone
American Bison
Bison bison
9,528 observations
Elk
Cervus canadensis
5,406 observations
American Black Bear
Ursus americanus
2,324 observations
Pronghorn
Antilocapra americana
1,920 observations
Brown Bear
Ursus arctos
1,759 observations
Coyote
Canis latrans
1,623 observations
Uinta Ground Squirrel
Urocitellus armatus
1,185 observations · iNaturalist
Gray Wolf
Canis lupus
1,143 observations
Bighorn Sheep
Ovis canadensis
1,022 observations
Mule Deer
Odocoileus hemionus
1,005 observations
Yellow-bellied Marmot
Marmota flaviventris
977 observations
Common Golden-mantled Ground Squirrel
Callospermophilus lateralis
715 observations
American Red Squirrel
Tamiasciurus hudsonicus
666 observations
Moose
Alces alces
652 observations
Red Fox
Vulpes vulpes
479 observations
Mountain Goat
Oreamnos americanus
246 observations
American Badger
Taxidea taxus
205 observations
Least Chipmunk
Neotamias minimus
204 observations
American Pika
Ochotona princeps
167 observations
Snowshoe Hare
Lepus americanus
166 observations
Yellow-pine Chipmunk
Neotamias amoenus
143 observations
Muskrat
Ondatra zibethicus
142 observations
Mountain Cottontail
Sylvilagus nuttallii
93 observations
North American River Otter
Lontra canadensis
90 observations
American Beaver
Castor canadensis
79 observations
Pacific Marten
Martes caurina
60 observations · iNaturalist
White-tailed Deer
Odocoileus virginianus
47 observations
Long-tailed Weasel
Neogale frenata
38 observations · iNaturalist
White-tailed Jackrabbit
Lepus townsendii
36 observations
Northern Pocket Gopher
Thomomys talpoides
26 observations · iNaturalist
North American Porcupine
Erethizon dorsatum
25 observations
Uinta Chipmunk
Neotamias umbrinus
23 observations · iNaturalist
Mountain Lion
Puma concolor
19 observations
Western Deer Mouse
Peromyscus sonoriensis
12 observations · iNaturalist
Bobcat
Lynx rufus
11 observations
American Ermine
Mustela richardsonii
8 observations · iNaturalist
Southern Red-backed Vole
Clethrionomys gapperi
8 observations · iNaturalist
Little Brown Bat
Myotis lucifugus
7 observations
Bushy-tailed Woodrat
Neotoma cinerea
5 observations
Common Raccoon
Procyon lotor
4 observations
Striped Skunk
Mephitis mephitis
4 observations
Long-legged Myotis
Myotis volans
2 observations
Western Water Shrew
Sorex navigator
2 observations · iNaturalist
Long-eared Myotis
Myotis evotis
1 observation
Northern Hoary Bat
Lasiurus cinereus
1 observation
Desert Cottontail
Sylvilagus audubonii
1 observation
Black-tailed Prairie Dog
Cynomys ludovicianus
1 observation
Northern Flying Squirrel
Glaucomys sabrinus
1 observation
Western Small-footed Myotis
Myotis ciliolabrum
1 observation · iNaturalist
Domestic Cat
Felis catus
1 observation