Mammals of Wyoming

100 established wild species in Wyoming. Plus 21 range-listed species with few or no digitized records.

All species A-Z →

Abert's Squirrel (Sciurus aberti)

Abert's Squirrel

Sciurus aberti

Marginal occurrence · 2 records
Size 27.9–76.2 cm0.9–2.5 ft Weight 540–971 g1.2–2.1 lb active by day pinyon-juniper woodland

Sightings by month

AmericanBadger

American Badger

Taxidea taxus

Common in Wyoming 413 sightings
Size 63.9 cm2.1 ft Weight 4–12 kg8.8–26.5 lb active by night grassland

Sightings by month

Beaver swimming low in murky green pond water with only its wet head and back above the surface

American Beaver

Castor canadensis

Common in Wyoming 437 sightings
Size 60–90 cm2–3 ft Weight 11–32 kg24.3–70.5 lb active day & night river

Sightings by month

Image-American bison rests at hot spring in yellowstone national park 1

American Bison

Bison bison

Common in Wyoming 10,777 sightings
Size 1.9–2 m6.1–6.6 ft Weight 360–1000 kg793.7–2204.6 lb active day & night grassland

Sightings by month

Oso negro (Ursus americanus), Parque natural provincial Tatshenshini-Alsek, Yukón, Canadá, 2017-08-25, DD 85

American Black Bear

Ursus americanus

Common in Wyoming 3,152 sightings
Size 1.2–2 m3.9–6.6 ft Weight 40–250 kg88.2–551.2 lb active by night conifer forest

Sightings by month

Mustela Erminea head

American Ermine

Mustela erminea

Occasional in Wyoming 19 sightings
Size 17–33 cm6.7–13 in Weight 70–260 g2.5–9.2 oz active by night coniferous forest

Sightings by month

Norka amerykańska (neovison vison)

American Mink

Neogale vison

Occasional in Wyoming 62 sightings
Size 33–45.7 cm13–18 in Weight 0.5–1.4 kg1–3 lb active day & night lake

Sightings by month

American pika perched on a talus rock with a mouthful of alpine wildflowers

American Pika

Ochotona princeps

Common in Wyoming 927 sightings
Size 19 cm7.5 in Weight 140 g4.9 oz active day & night rocky outcrop

Sightings by month

Tamiasciurus hudsonicus James Gardens

American Red Squirrel

Tamiasciurus hudsonicus

Common in Wyoming 1,486 sightings
Size 17–23 cm6.7–9.1 in Weight 140–310 g4.9–10.9 oz active by day wetland

Sightings by month

American water shrew swimming at the surface of a stream, seen from above

American water shrew

Sorex palustris

Common in Wyoming 255 sightings
Size 8 cm3.1 in Weight 8–18 g0.3–0.6 oz active day & night river

Sightings by month

Big Brown Bats (Eptesicus fuscus)

Big Brown Bat

Eptesicus fuscus

Rarely seen in Wyoming 10 sightings
Size 7.5 cm3 in Weight 17 g0.6 oz active by night agricultural

Sightings by month

New Mexico Bighorn Sheep

Bighorn Sheep

Ovis canadensis

Common in Wyoming 1,364 sightings
Size 1.7 m5.5 ft Weight 58–143 kg127.9–315.3 lb active day & night desert

Sightings by month

Black-footed ferret checking out his new digs (30027077935)

Black-footed Ferret

Mustela nigripes

Occasional in Wyoming 46 sightings
Size 38–50 cm15–19.7 in Weight 0.7–1.2 kg1.4–2.6 lb active by night great basin desert

Sightings by month

Black-tailed jackrabbit (6785302534)

Black-tailed Jackrabbit

Lepus californicus

Occasional in Wyoming 17 sightings
Size 47–63 cm1.5–2.1 ft Weight 1.3–3.6 kg2.9–7.9 lb active by night open desert

Sightings by month

black-tailed prairie dog (Cynomys ludovicianus)

Black-tailed Prairie Dog

Cynomys ludovicianus

Common in Wyoming 605 sightings
Size 28–36 cm11–14.2 in Weight 0.7–1.5 kg1.5–3.3 lb active by day grassland

Sightings by month

Bobcat (Lynx rufus)

Bobcat

Lynx rufus

Occasional in Wyoming 34 sightings
Size 30–60 cm11.8–23.6 in Weight 4–18 kg8.8–39.7 lb active by night forest edge

Sightings by month

Botta's Pocket Gopher (Thomomys bottae)

Botta's Pocket Gopher

Thomomys bottae

Size 18–27 cm7.1–10.6 in Weight 160–250 g5.6–8.8 oz active day & night woodland

Sightings by month

Grizzly brown bear standing in a green meadow in Yellowstone National Park

Brown Bear

Ursus arctos

Common in Wyoming 2,363 sightings
Size 1–2.8 m3.3–9.2 ft Weight 130–700 kg286.6–1543.2 lb active day & night forest

Sightings by month

Bushy-tailed woodrat peering from forest floor cover at Oregon Caves

Bushy-tailed Woodrat

Neotoma cinerea

Occasional in Wyoming 86 sightings
Size 22.7 cm8.9 in Weight 286 g10.1 oz active by night coniferous forest

Sightings by month

California Myotis (Myotis californicus)

California Myotis

Myotis californicus

Rarely seen in Wyoming 14 sightings
Size 3–3.5 cm1.2–1.4 in Weight 4 g0.1 oz active by night coastal

Sightings by month

Lynx Canadensis

Canada Lynx

Lynx canadensis

Marginal occurrence · 3 records
Size 48–56 cm18.9–22 in Weight 5–17 kg11–37.5 lb active by night coniferous forest
AI-generated image: canyon mouse crouched alert on desert rock at dusk. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy

Canyon mouse

Peromyscus crinitus

Occasional in Wyoming 16 sightings
Size 8.4 cm3.3 in Weight 16 g0.6 oz active by night desert

Sightings by month

Cliff Chipmunk (Neotamias dorsalis)

Cliff Chipmunk

Neotamias dorsalis

Rarely seen in Wyoming 15 sightings
Size 21–25 cm8.3–9.8 in Weight 55–75 g1.9–2.6 oz active by day rocky outcrop

Sightings by month

Colorado Chipmunk in natural habitat

Colorado Chipmunk

Neotamias quadrivittatus

Marginal occurrence · 6 records
Size 20–24 cm7.9–9.4 in Weight 62 g2.2 oz active by day wetland
Common golden-mantled ground squirrel on a fallen log, showing its plain face and striped sides

Common Golden-mantled Ground Squirrel

Callospermophilus lateralis

Common in Wyoming 1,577 sightings
Size 23–32 cm9.1–12.6 in Weight 120–350 g4.2–12.3 oz active by day chaparral

Sightings by month

Common Raccoon in Hugh Taylor Birch State Park

Common Raccoon

Procyon lotor

Occasional in Wyoming 86 sightings
Size 40–70 cm1.3–2.3 ft Weight 3.5–9 kg7.7–19.8 lb active by night mixed forest

Sightings by month

Mother Coyote Sitting, Watching Over Den, Photo 1 of 2 (47924154788)

Coyote

Canis latrans

Common in Wyoming 1,995 sightings
Size 0.8–1 m2.5–3.3 ft Weight 7–21 kg15.4–46.3 lb active day & night urban

Sightings by month

Desert cottontail rabbit (Sylvilagus audubonii) (5-13-11) patagonia lake, scc, az -01 (5720663856)

Desert Cottontail

Sylvilagus audubonii

Occasional in Wyoming 80 sightings
Size 35–43 cm13.8–16.9 in Weight 0.7–1.2 kg1.5–2.6 lb active day & night desert

Sightings by month

AI-generated image: Dwarf Shrew in side profile crossing rocky alpine gravel. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy

Dwarf Shrew

Sorex nanus

Occasional in Wyoming 45 sightings
Size 5.6 cm2.2 in Weight 2–3 g0.1 oz active day & night great basin desert

Sightings by month

Blacklick Woods - Eastern cottontail feeding 1

Eastern Cottontail

Sylvilagus floridanus

Rarely seen in Wyoming 6 sightings
Size 36–43 cm14.2–16.9 in Weight 0.8–1.5 kg1.8–3.3 lb active day & night lake

Sightings by month

Grey squirrel (Sciurus carolinensis) 01

Eastern Gray Squirrel

Sciurus carolinensis

Occasional in Wyoming 28 sightings
Size 23–30 cm9.1–11.8 in Weight 400–710 g0.9–1.6 lb active by day wetland

Sightings by month

Eastern Mole (Scalopus aquaticus)

Eastern Mole

Scalopus aquaticus

Marginal occurrence · 7 records
Size 14.8 cm5.8 in Weight 75 g2.6 oz active day & night river

Sightings by month

Eastern red bat roosting among green leaves, disguised as a dead leaf

Eastern Red Bat

Lasiurus borealis

Marginal occurrence · 2 records
Size 9.3–11.7 cm3.7–4.6 in Weight 7–13 g0.2–0.5 oz active by night desert
Elk (Cervus canadensis)

Elk

Cervus canadensis

Common in Wyoming 6,388 sightings
Size 1.6–2.7 m5.2–8.9 ft Weight 178–497 kg392.4–1095.7 lb active day & night forest edge

Sightings by month

European rabbit feeding in dry vegetation

European Rabbit

Oryctolagus cuniculus

Marginal occurrence · 1 record
Size 34–50 cm13.4–19.7 in Weight 1–2.5 kg2.2–5.5 lb active by night grassland
Sciurus niger

Fox Squirrel

Sciurus niger

Common in Wyoming 261 sightings
Size 25.4–38.1 cm10–15 in Weight 804 g1.8 lb active by day river

Sightings by month

Fringed Myotis (Myotis thysanodes)

Fringed Myotis

Myotis thysanodes

Occasional in Wyoming 16 sightings
Size 5.4 cm2.1 in Weight 9 g0.3 oz active by night desert

Sightings by month

Silver-gray wolf walking along a gravel bank in Alaska

Gray Wolf

Canis lupus

Common in Wyoming 1,205 sightings
Size 1.1–1.6 m3.4–5.2 ft Weight 23–80 kg50.7–176.4 lb active day & night cave

Sightings by month

Gunnison's Prairie Dog (Cynomys gunnisoni)

Gunnison's Prairie Dog

Cynomys gunnisoni

Marginal occurrence · 4 records
Size 30.5 cm12 in Weight 807 g1.8 lb active by day desert
Hispid pocket mouse standing on pale rocky ground at night

Hispid Pocket Mouse

Chaetodipus hispidus

Occasional in Wyoming 30 sightings
Size 17–23 cm6.7–9.1 in Weight 30–47 g1.1–1.7 oz active by night river

Sightings by month

House mouse in dry plant litter

House Mouse

Mus musculus

Rarely seen in Wyoming 9 sightings
Size 5–10 cm2–3.9 in Weight 12–30 g0.4–1.1 oz active by night agricultural

Sightings by month

Taschenratte-Zion-National-Park

Idaho pocket gopher

Thomomys idahoensis

Occasional in Wyoming 51 sightings
Size 22.9 cm9 in Weight 101 g3.6 oz active by night savanna

Sightings by month

Least Chipmunk in natural habitat

Least Chipmunk

Neotamias minimus

Common in Wyoming 620 sightings
Size 10–11 cm3.9–4.3 in Weight 41–47 g1.4–1.7 oz active by day shrubland

Sightings by month

Least Weasel (Mustela nivalis)

Least Weasel

Mustela nivalis

Marginal occurrence · 7 records
Size 26 cm10.2 in Weight 50 g1.8 oz active by night grassland
Long-eared myotis peering over weathered wood

Long-eared Myotis

Myotis evotis

Rarely seen in Wyoming 10 sightings
Size 8.7–10 cm3.4–3.9 in Weight 7 g0.2 oz active by night shrubland

Sightings by month

Long-legged myotis roosting on tree bark with wings folded

Long-legged Myotis

Myotis volans

Occasional in Wyoming 86 sightings
Size 8.3–10.6 cm3.3–4.2 in Weight 6–10 g0.2–0.4 oz active by night urban

Sightings by month

Long-tailed vole peering from rocks

Long-tailed Vole

Microtus longicaudus

Common in Wyoming 721 sightings
Size 13.5 cm5.3 in Weight 50 g1.8 oz active day & night cave

Sightings by month

Long-tailed weasel standing alert in grass with its black-tipped tail curled behind it, Sonoma County, California

Long-tailed Weasel

Neogale frenata

Occasional in Wyoming 128 sightings
Size 24.8 cm9.8 in Weight 170 g6 oz active day & night wetland

Sightings by month

Sorex cinereus, Harwich, Chatham, Ontario, Canada 1

Masked Shrew

Sorex cinereus

Common in Wyoming 513 sightings
Size 6.9 cm2.7 in Weight 5 g0.2 oz active day & night grassland

Sightings by month

AI-generated image: Merriam's Shrew in side profile on dry soil among rocks. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy

Merriam's Shrew

Sorex merriami

Occasional in Wyoming 33 sightings
Size 6.2 cm2.4 in Weight 5 g0.2 oz active day & night desert

Sightings by month

AI-generated image: Montane Shrew in side profile on mossy forest floor. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy

Montane Shrew

Sorex monticolus

Common in Wyoming 945 sightings
Size 6.8 cm2.7 in Weight 6 g0.2 oz active day & night riparian

Sightings by month

Montane vole peering out from lichen-covered alpine rocks

Montane Vole

Microtus montanus

Common in Wyoming 1,276 sightings
Size 14–22 cm5.5–8.7 in Weight 35 g1.2 oz active day & night montane forest

Sightings by month

Cow moose standing in a marshy Alaska wetland

Moose

Alces alces

Common in Wyoming 4,373 sightings
Size 2.4–3.1 m7.9–10.2 ft Weight 200–490 kg440.9–1080.3 lb active day & night wetland

Sightings by month

Mountain cottontail in dry western woodland edge

Mountain Cottontail

Sylvilagus nuttallii

Common in Wyoming 172 sightings
Size 27.9–38.1 cm11–15 in Weight 0.6–1.1 kg1.3–2.4 lb active day & night coniferous forest

Sightings by month

Mountain goat standing on a rocky overlook above Hidden Lake in Glacier National Park with snow-streaked peaks behind

Mountain Goat

Oreamnos americanus

Common in Wyoming 403 sightings
Size 1.2–1.8 m3.9–5.9 ft Weight 45–140 kg99.2–308.6 lb active day & night subalpine

Sightings by month

Mountain Lion (Puma concolor)

Mountain Lion

Puma concolor

Occasional in Wyoming 67 sightings
Size 1–1.5 m3.3–5.1 ft Weight 36–120 kg79.4–264.6 lb active day & night montane forest

Sightings by month

Mule Deer (Odocoileus hemionus)

Mule Deer

Odocoileus hemionus

Common in Wyoming 3,313 sightings
Size 1.3–1.7 m4.1–5.5 ft Weight 55–150 kg121.3–330.7 lb active day & night river

Sightings by month

Muskrats resting on a floating log in open water

Muskrat

Ondatra zibethicus

Common in Wyoming 289 sightings
Size 25–36 cm9.8–14.2 in Weight 0.6–2 kg1.3–4.4 lb active day & night wetland

Sightings by month

Deer Mouse (Peromyscus maniculatus) (9310532204)

North American Deermouse

Peromyscus maniculatus

Common in Wyoming 6,189 sightings
Size 8–10 cm3.1–3.9 in Weight 21 g0.7 oz active by night river

Sightings by month

Erethizontidae Erethizon dorsatum 3.2

North American Porcupine

Erethizon dorsatus

Occasional in Wyoming 142 sightings
Size 60–90 cm2–3 ft Weight 3.5–12 kg7.7–26.5 lb active by night mixed forest

Sightings by month

River Otter (Lontra canadensis)

North American River Otter

Lontra canadensis

Common in Wyoming 182 sightings
Size 0.7–1.1 m2.2–3.5 ft Weight 5–15 kg11–33.1 lb active day & night river

Sightings by month

Northern Flying Squirrel (Glaucomys sabrinus)

Northern Flying Squirrel

Glaucomys sabrinus

Rarely seen in Wyoming 5 sightings
Size 25–37 cm9.8–14.6 in Weight 148 g5.2 oz active by night mixed conifer

Sightings by month

Northern grasshopper mouse walking beside desert grass

Northern Grasshopper Mouse

Onychomys leucogaster

Occasional in Wyoming 20 sightings
Size 12.7 cm5 in Weight 33 g1.2 oz active by night grassland

Sightings by month

Hoary bat in flight against blue sky, wings spread to show its yellow throat patch and heavily frosted fur

Northern Hoary Bat

Lasiurus cinereus

Marginal occurrence · 33 records
Size 13–15 cm5.1–5.9 in Weight 26 g0.9 oz active by night cave
Live northern montane shrew standing alert on sunlit sphagnum moss with dry grass stems around it

Northern Montane Shrew

Sorex obscurus

Rarely seen in Wyoming 14 sightings
Size 7.6 cm3 in Weight 7 g0.2 oz active by night montane forest

Sightings by month

Northern myotis hanging head-down from a rock ceiling, long ears and tan fur visible

Northern Myotis

Myotis septentrionalis

Marginal occurrence · 5 records
Size 8.6 cm3.4 in Weight 6 g0.2 oz active by night coniferous forest
Northern pocket gopher in low vegetation

Northern pocket gopher

Thomomys talpoides

Occasional in Wyoming 99 sightings
Size 22.9 cm9 in Weight 60–160 g2.1–5.6 oz active day & night river

Sightings by month

Live Norway rat beside shallow water

Norway Rat

Rattus norvegicus

Occasional in Wyoming 25 sightings
Size 15–28 cm5.9–11 in Weight 140–500 g0.3–1.1 lb active by night urban

Sightings by month

Olive-backed pocket mouse in grass and dry litter at night

Olive-backed Pocket Mouse

Perognathus fasciatus

Common in Wyoming 203 sightings
Size 8 cm3.1 in Weight 11–14 g0.4–0.5 oz active by night grassland

Sightings by month

Ord's kangaroo rat standing in profile, showing its huge hind feet and long tufted tail

Ord's Kangaroo Rat

Dipodomys ordii

Occasional in Wyoming 52 sightings
Size 21–36.5 cm8.3–14.4 in Weight 50 g1.8 oz active by night great basin desert

Sightings by month

Pacific Marten (Martes caurina)

Pacific Marten

Martes caurina

Occasional in Wyoming 151 sightings
Size 50–70 cm1.6–2.3 ft Weight 0.5–1.4 kg1.1–3.1 lb active by night coniferous forest

Sightings by month

Pallid bat roosting on a cave wall

Pallid Bat

Antrozous pallidus

Occasional in Wyoming 17 sightings
Size 6–8.5 cm2.4–3.3 in Weight 14–25 g0.5–0.9 oz active by night desert scrub

Sightings by month

Pinyon mouse under loose bark showing large ears and long tail

Pinyon mouse

Peromyscus truei

Marginal occurrence · 2 records
Size 10.2 cm4 in Weight 33 g1.2 oz active by night pinyon-juniper woodland

Sightings by month

Plains harvest mouse close-up among dry grass stems and twigs

Plains Harvest Mouse

Reithrodontomys montanus

Rarely seen in Wyoming 12 sightings
Size 7.6 cm3 in Weight 10 g0.4 oz active by night grassland

Sightings by month

Apache pocket mouse, a subspecies of the plains pocket mouse, eating seeds on sandy ground

Plains pocket mouse

Perognathus flavescens

Rarely seen in Wyoming 11 sightings
Size 6.9 cm2.7 in Weight 9 g0.3 oz active by night desert

Sightings by month

Plains spotted skunk walking through rocky leaf litter in Texas

Plains Spotted Skunk

Spilogale interrupta

Range-listed · no digitized records yet
Size 35–55 cm13.8–21.7 in Weight 583 g1.3 lb active by night wetland
AI-generated image: Prairie Shrew foraging in shortgrass prairie ground litter. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy.

Prairie Shrew

Sorex haydeni

Rarely seen in Wyoming 14 sightings
Size 7–10 cm2.8–3.9 in Weight 3–6 g0.1–0.2 oz active by night prairie

Sightings by month

AI-generated image: Prairie Vole alert in a grassy meadow, stocky grizzled brown-gray body and short tail. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy

Prairie Vole

Microtus ochrogaster

Common in Wyoming 306 sightings
Size 12.4 cm4.9 in Weight 47 g1.7 oz active day & night grassland

Sightings by month

AI-generated image: Preble's Shrew in side profile on dry soil among grass. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy

Preble's Shrew

Sorex preblei

Marginal occurrence · 9 records
Size 5.5 cm2.2 in Weight 3 g0.1 oz active day & night great basin desert
Pronghorn buck standing in a meadow of yellow wildflowers

Pronghorn

Antilocapra americana

Common in Wyoming 4,528 sightings
Size 1.2–1.5 m3.9–4.9 ft Weight 32–70 kg70.5–154.3 lb active day & night grassland

Sightings by month

Pygmy rabbit (22694681746)

Pygmy Rabbit

Sylvilagus idahoensis

Rarely seen in Wyoming 12 sightings
Size 23.5–29.5 cm9.3–11.6 in Weight 375–500 g0.8–1.1 lb active day & night great basin desert

Sightings by month

Red Fox (Vulpes vulpes)

Red Fox

Vulpes vulpes

Common in Wyoming 1,001 sightings
Size 43 cm16.9 in Weight 5–10 kg11–22 lb active day & night desert

Sightings by month

Ringtail standing on rocks at night with its black-and-white banded tail visible

Ringtail

Bassariscus astutus

Marginal occurrence · 2 records
Size 30–42 cm11.8–16.5 in Weight 0.7–1.1 kg1.5–2.5 lb active by night urban
Sagebrush vole partly hidden in low shrub cover

Sagebrush Vole

Lemmiscus curtatus

Occasional in Wyoming 112 sightings
Size 11–14 cm4.3–5.5 in Weight 28 g1 oz active day & night shrubland

Sightings by month

Sand Hills pocket gopher peering from a burrow entrance in sandy soil

Sand Hills Pocket Gopher

Geomys lutescens

Occasional in Wyoming 84 sightings
Size 12.7–35.6 cm5–14 in Weight 187 g6.6 oz active day & night sandy prairie

Sightings by month

Silky pocket mouse crouched on sandy grassland ground

Silky Pocket Mouse

Perognathus flavus

Rarely seen in Wyoming 10 sightings
Size 9.5–11.8 cm3.7–4.6 in Weight 6–9 g0.2–0.3 oz active by night grassland

Sightings by month

Silver-haired bat tucked into loose bark

Silver-haired Bat

Lasionycteris noctivagans

Rarely seen in Wyoming 7 sightings
Size 9.5–11.5 cm3.7–4.5 in Weight 11 g0.4 oz active by night river

Sightings by month

Lepus americanus 5459 cropped

Snowshoe Hare

Lepus americanus

Common in Wyoming 216 sightings
Size 41–52 cm16.1–20.5 in Weight 1.4–1.6 kg3.2–3.4 lb active by night coniferous forest

Sightings by month

Southern red-backed vole feeding among sunflower seeds on snow

Southern Red-backed Vole

Clethrionomys gapperi

Occasional in Wyoming 106 sightings
Size 12–16.5 cm4.7–6.5 in Weight 6–42 g0.2–1.5 oz active by night mixed forest

Sightings by month

Live western jumping mouse crouched in leaf litter with its long tail curving behind

Southwestern Jumping Mouse

Zapus princeps

Common in Wyoming 944 sightings
Size 22–25 cm8.7–9.8 in Weight 28 g1 oz active by night montane forest

Sightings by month

Spotted bat facing forward with huge pale ears and white shoulder patches

Spotted Bat

Euderma maculatum

Marginal occurrence · 3 records
Size 12.6 cm5 in Weight 16–20 g0.6–0.7 oz active by night rocky outcrop

Sightings by month

Spotted ground squirrel sitting upright at a burrow entrance, its back covered in scattered white spots

Spotted Ground Squirrel

Xerospermophilus spilosoma

Occasional in Wyoming 29 sightings
Size 18–25 cm7.1–9.8 in Weight 100–200 g3.5–7.1 oz active by day grassland

Sightings by month

Mephitis mephitis in Dierenpark Zie-ZOO

Striped Skunk

Mephitis mephitis

Occasional in Wyoming 59 sightings
Size 46.5–81.5 cm1.5–2.7 ft Weight 0.6–6.3 kg1.3–13.9 lb active by night grassland

Sightings by month

Swift fox at a burrow entrance on the shortgrass prairie

Swift Fox

Vulpes velox

Occasional in Wyoming 88 sightings
Size 38–53 cm15–20.9 in Weight 1.6–3 kg3.5–6.6 lb active day & night grassland

Sightings by month

Thirteen-lined ground squirrel crouched beside short grass

Thirteen-lined ground squirrel

Ictidomys tridecemlineatus

Occasional in Wyoming 50 sightings
Size 17–30 cm6.7–11.8 in Weight 173 g6.1 oz active by day grassland

Sightings by month

Townsend's big-eared bat roosting on a cave wall

Townsend's Big-eared Bat

Corynorhinus townsendii

Rarely seen in Wyoming 8 sightings
Size 5.8 cm2.3 in Weight 9–11 g0.3–0.4 oz active by night coastal

Sightings by month

Tricolored Bat hibernating on a limestone mine wall

Tricolored Bat

Perimyotis subflavus

Marginal occurrence · 1 record
Size 7.7–8.9 cm3–3.5 in Weight 5–8 g0.2–0.3 oz active by night cave
Uinta Chipmunk in natural habitat

Uinta Chipmunk

Neotamias umbrinus

Occasional in Wyoming 48 sightings
Size 14.2 cm5.6 in Weight 52 g1.8 oz active by day montane forest

Sightings by month

Uinta ground squirrel (14952252050)

Uinta Ground Squirrel

Urocitellus armatus

Common in Wyoming 2,303 sightings
Size 28–30 cm11–11.8 in Weight 210 g7.4 oz active by day river

Sightings by month

Vagrant shrew crossing bare sandy ground

Vagrant Shrew

Sorex vagrans

Common in Wyoming 203 sightings
Size 6.8 cm2.7 in Weight 4–8 g0.1–0.3 oz active day & night montane forest

Sightings by month

Virginia Opossum clinging to a tree branch in a snowy winter woodland

Virginia Opossum

Didelphis virginiana

Marginal occurrence · 7 records
Size 40.8 cm16.1 in Weight 1.1–1.6 kg2.5–3.6 lb active by night river

Sightings by month

Western deer mouse sheltering in a rock crevice

Western Deer Mouse

Peromyscus sonoriensis

Occasional in Wyoming 43 sightings
Size 12–20 cm4.7–7.9 in Weight 15–32 g0.5–1.1 oz active by night river

Sightings by month

Western harvest mouse moving through dry stems and gravel

Western Harvest Mouse

Reithrodontomys megalotis

Occasional in Wyoming 117 sightings
Size 11.8–17 cm4.6–6.7 in Weight 11 g0.4 oz active by night wetland

Sightings by month

Western heather vole tucked among moss and wet alpine leaves

Western Heather Vole

Phenacomys intermedius

Common in Wyoming 166 sightings
Size 11.2 cm4.4 in Weight 40 g1.4 oz active day & night alpine

Sightings by month

Little brown myotis roosting alertly on a wooden beam

Western Little Brown Myotis

Myotis lucifugus

Rarely seen in Wyoming 12 sightings
Size 8–9.5 cm3.1–3.7 in Weight 6–13 g0.2–0.5 oz active by night cave

Sightings by month

Western meadow vole Talkeetna alaska

Western Meadow Vole

Microtus drummondii

Common in Wyoming 462 sightings
Size 13–20 cm5.1–7.9 in Weight 39 g1.4 oz active day & night river

Sightings by month

AI-generated image: Western Pygmy Shrew in side profile on mossy forest floor. No public-domain photograph of this species exists. This image was generated with AI from verified reference material and reviewed by our editorial team for accuracy

Western Pygmy Shrew

Sorex eximius

Range-listed · no digitized records yet
Size 5–7 cm2–2.8 in Weight 2–4 g0.1 oz active day & night montane conifer forest
Western small-footed myotis roosting on wood with its dark face mask visible

Western Small-footed Myotis

Myotis ciliolabrum

Rarely seen in Wyoming 3 sightings
Size 8–10 cm3.1–3.9 in Weight 4–5 g0.1–0.2 oz active by night desert

Sightings by month

Western spotted skunk with a clear broken-stripe pattern, alert on a branch at night

Western Spotted Skunk

Spilogale gracilis

Marginal occurrence · 6 records
Size 35–45 cm13.8–17.7 in Weight 336–734 g0.7–1.6 lb active by night mixed forest
Western water shrew at the grassy edge of a stream

Western Water Shrew

Sorex navigator

Occasional in Wyoming 47 sightings
Size 13–17 cm5.1–6.7 in Weight 13 g0.5 oz active day & night river

Sightings by month

White-footed mouse on a fallen log in leaf litter

White-footed Mouse

Peromyscus leucopus

Occasional in Wyoming 21 sightings
Size 10.1 cm4 in Weight 20–30 g0.7–1.1 oz active by night urban

Sightings by month

White-tailed Deer (Odocoileus virginianus)

White-tailed Deer

Odocoileus virginianus

Common in Wyoming 369 sightings
Size 0.9–2.2 m3.1–7.2 ft Weight 68–136 kg149.9–299.8 lb active day & night mixed forest

Sightings by month

White-tailed Jackrabbit (Lepus townsendii)

White-tailed Jackrabbit

Lepus townsendii

Occasional in Wyoming 162 sightings
Size 45–65 cm1.5–2.1 ft Weight 2.6–4.3 kg5.7–9.5 lb active by night grassland

Sightings by month

Whitetailedprairiedoghi

White-tailed Prairie Dog

Cynomys leucurus

Common in Wyoming 401 sightings
Size 30–37 cm11.8–14.6 in Weight 0.8–1.5 kg1.8–3.3 lb active by day grassland

Sightings by month

Adult wild boar foraging in grass

Wild Boar

Sus scrofa

Marginal occurrence · 3 records
Size 85–90 cm2.8–3 ft Weight 40–50 kg88.2–110.2 lb active day & night lake

Sightings by month

Wolverine (Gulo gulo)

Wolverine

Gulo gulo

Marginal occurrence · 5 records
Size 17–26 cm6.7–10.2 in Weight 7–18 kg15.4–39.7 lb active by night urban

Sightings by month

Wyoming ground squirrel peering from a burrow entrance

Wyoming Ground Squirrel

Urocitellus elegans

Common in Wyoming 256 sightings
Size 19–24 cm7.5–9.4 in Weight 299 g10.5 oz active by day montane forest

Sightings by month

Taschenratte-Zion-National-Park

Wyoming pocket gopher

Thomomys clusius

Occasional in Wyoming 18 sightings
Size 15–20 cm5.9–7.9 in Weight 60–120 g2.1–4.2 oz active by night prairie

Sightings by month

Marmota flaviventris (29862435206)

Yellow-bellied Marmot

Marmota flaviventris

Common in Wyoming 2,397 sightings
Size 47–68 cm1.5–2.2 ft Weight 3–5 kg6.6–11 lb active by day great basin desert

Sightings by month

Yellow-pine Chipmunk 2a wray (8272946686)

Yellow-pine Chipmunk

Neotamias amoenus

Common in Wyoming 280 sightings
Size 18.1–24.5 cm7.1–9.6 in Weight 30–70 g1.1–2.5 oz active by day grassland

Sightings by month

Yuma myotis crouched on the ground at night

Yuma Myotis

Myotis yumanensis

Rarely seen in Wyoming 11 sightings
Size 8.4–9.9 cm3.3–3.9 in Weight 6 g0.2 oz active by night coniferous forest

Sightings by month