Mammals of Idaho

96 established wild species in Idaho. Plus 22 range-listed species with few or no digitized records.

All species A-Z →

AmericanBadger

American Badger

Taxidea taxus

Common in Idaho 155 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 Idaho 501 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

Marginal occurrence · 7 records
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 Idaho 177 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 Idaho 24 sightings
Size 17–33 cm6.7–13 in Weight 70–260 g2.5–9.2 oz active by night coniferous forest

Sightings by month

Marten in a tree

American marten

Martes americana

Occasional in Idaho 65 sightings
Size 32–45 cm12.6–17.7 in Weight 0.5–1.4 kg1.1–3.1 lb active by night lake

Sightings by month

Norka amerykańska (neovison vison)

American Mink

Neogale vison

Common in Idaho 173 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 Idaho 284 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 Idaho 788 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 Idaho 174 sightings
Size 8 cm3.1 in Weight 8–18 g0.3–0.6 oz active day & night river

Sightings by month

SQUIRREL, BELDING'S GROUND (Spermophilus beldingi) (8-1-2016) 10,000 ft,, ruby mts., elko co, nv (7) (29286699865)

Belding's Ground Squirrel

Urocitellus beldingi

Rarely seen in Idaho 16 sightings
Size 23–30 cm9.1–11.8 in Weight 290 g10.2 oz active by day lake

Sightings by month

Big Brown Bats (Eptesicus fuscus)

Big Brown Bat

Eptesicus fuscus

Rarely seen in Idaho 12 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 Idaho 245 sightings
Size 1.7 m5.5 ft Weight 58–143 kg127.9–315.3 lb active day & night desert

Sightings by month

Live black rat climbing through branches

Black Rat

Rattus rattus

Marginal occurrence · 2 records
Size 16–24 cm6.3–9.4 in Weight 75–230 g2.6–8.1 oz active by night agricultural
Black-tailed jackrabbit (6785302534)

Black-tailed Jackrabbit

Lepus californicus

Occasional in Idaho 80 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

Bobcat (Lynx rufus)

Bobcat

Lynx rufus

Occasional in Idaho 64 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

Rarely seen in Idaho 7 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 Idaho 39 sightings
Size 22.7 cm8.9 in Weight 286 g10.1 oz active by night coniferous forest

Sightings by month

AI-generated image: California Kangaroo Mouse perched bipedal on fine desert soil beside shrub cover at night. 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.

California Kangaroo Mouse

Microdipodops californicus

active by night great basin desert
California Myotis (Myotis californicus)

California Myotis

Myotis californicus

Rarely seen in Idaho 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 · 5 records
Size 48–56 cm18.9–22 in Weight 5–17 kg11–37.5 lb active by night coniferous forest
Canyon bat clinging to weathered tree bark

Canyon Bat

Parastrellus hesperus

Marginal occurrence · 3 records
Size 6.2–8 cm2.4–3.1 in Weight 3–6 g0.1–0.2 oz active by night desert
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 Idaho 39 sightings
Size 8.4 cm3.3 in Weight 16 g0.6 oz active by night desert

Sightings by month

Chisel-toothed kangaroo rat crouched on gravelly desert soil

Chisel-toothed kangaroo rat

Dipodomys microps

Occasional in Idaho 37 sightings
Size 15.6 cm6.1 in Weight 55 g1.9 oz active by night desert

Sightings by month

Cliff Chipmunk (Neotamias dorsalis)

Cliff Chipmunk

Neotamias dorsalis

Marginal occurrence · 6 records
Size 21–25 cm8.3–9.8 in Weight 55–75 g1.9–2.6 oz active by day rocky outcrop
Coast Mole (Scapanus orarius)

Coast Mole

Scapanus orarius

Marginal occurrence · 1 record
Size 12.3 cm4.8 in Weight 62 g2.2 oz active by night coastal
Columbian ground squirrel Urocitellus columbianus

Columbian Ground Squirrel

Urocitellus columbianus

Common in Idaho 465 sightings
Size 33–41 cm13–16.1 in Weight 350–800 g0.8–1.8 lb active by day montane meadow

Sightings by month

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 Idaho 418 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

Common in Idaho 227 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 Idaho 466 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

Crater Chipmunk (Neotamias cratericus)

Crater Chipmunk

Neotamias cratericus

Occasional in Idaho 110 sightings
Size 18–23 cm7.1–9.1 in Weight 40–70 g1.4–2.5 oz active by day coniferous forest

Sightings by month

Dark kangaroo mouse on sandy ground at Mono Basin, California

Dark kangaroo mouse

Microdipodops megacephalus

Marginal occurrence · 7 records
Size 7.5 cm3 in Weight 13 g0.5 oz active by night river
Desert woodrat facing the camera among desert rocks at night

Desert Woodrat

Neotoma lepida

Occasional in Idaho 25 sightings
Size 17.1 cm6.7 in Weight 113 g4 oz active by 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

Range-listed · no digitized records yet
Size 5.6 cm2.2 in Weight 2–3 g0.1 oz active day & night great basin desert
Blacklick Woods - Eastern cottontail feeding 1

Eastern Cottontail

Sylvilagus floridanus

Marginal occurrence · 2 records
Size 36–43 cm14.2–16.9 in Weight 0.8–1.5 kg1.8–3.3 lb active day & night lake
Grey squirrel (Sciurus carolinensis) 01

Eastern Gray Squirrel

Sciurus carolinensis

Occasional in Idaho 40 sightings
Size 23–30 cm9.1–11.8 in Weight 400–710 g0.9–1.6 lb active by day wetland

Sightings by month

Elk (Cervus canadensis)

Elk

Cervus canadensis

Common in Idaho 656 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

Occasional in Idaho 81 sightings
Size 34–50 cm13.4–19.7 in Weight 1–2.5 kg2.2–5.5 lb active by night grassland

Sightings by month

Martes Pennanti

Fisher

Pekania pennanti

Rarely seen in Idaho 11 sightings
Size 75–95 cm2.5–3.1 ft Weight 3.5–6 kg7.7–13.2 lb active dawn & dusk wetland

Sightings by month

Sciurus niger

Fox Squirrel

Sciurus niger

Common in Idaho 2,303 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

Marginal occurrence · 1 record
Size 5.4 cm2.1 in Weight 9 g0.3 oz active by night desert
Silver-gray wolf walking along a gravel bank in Alaska

Gray Wolf

Canis lupus

Occasional in Idaho 99 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

Great Basin Pocket Mouse peering out from beneath desert shrub leaves

Great Basin Pocket Mouse

Perognathus parvus

Common in Idaho 541 sightings
Size 8.2 cm3.2 in Weight 21–22 g0.7–0.8 oz active by night great basin desert

Sightings by month

Hoary marmot (Marmota caligata) - Flickr - brewbooks (3)

Hoary Marmot

Marmota caligata

Marginal occurrence · 7 records
Size 62–82 cm2–2.7 ft Weight 3.5–10 kg7.7–22 lb active by day lake
House mouse in dry plant litter

House Mouse

Mus musculus

Occasional in Idaho 29 sightings
Size 5–10 cm2–3.9 in Weight 12–30 g0.4–1.1 oz active by night agricultural

Sightings by month

Southern Idaho ground squirrel in native habitat near burrow

Idaho Ground Squirrel

Urocitellus brunneus

Occasional in Idaho 72 sightings
Size 21–26 cm8.3–10.2 in Weight 110–290 g3.9–10.2 oz active by day montane meadow

Sightings by month

Taschenratte-Zion-National-Park

Idaho pocket gopher

Thomomys idahoensis

Occasional in Idaho 67 sightings
Size 22.9 cm9 in Weight 101 g3.6 oz active by night savanna

Sightings by month

Kit fox (Vulpes macrotis) standing in profile at night in desert scrub

Kit Fox

Vulpes macrotis

Range-listed · no digitized records yet
Size 37–53 cm14.6–20.9 in Weight 1.6–2.7 kg3.5–6 lb active by night desert
Least Chipmunk in natural habitat

Least Chipmunk

Neotamias minimus

Common in Idaho 173 sightings
Size 10–11 cm3.9–4.3 in Weight 41–47 g1.4–1.7 oz active by day shrubland

Sightings by month

Little pocket mouse moving over pale sandy soil at night

Little pocket mouse

Perognathus longimembris

Marginal occurrence · 6 records
Size 10.8–13.2 cm4.3–5.2 in Weight 8 g0.3 oz active by night grassland
Long-eared myotis peering over weathered wood

Long-eared Myotis

Myotis evotis

Rarely seen in Idaho 11 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 Idaho 21 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 Idaho 689 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 Idaho 83 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 Idaho 173 sightings
Size 6.9 cm2.7 in Weight 5 g0.2 oz active day & night grassland

Sightings by month

Urocitellus canus

Merriam's ground squirrel

Urocitellus canus

Occasional in Idaho 29 sightings
Size 18.8–21.8 cm7.4–8.6 in Weight 144–210 g5.1–7.4 oz active by day river

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 Idaho 22 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 Idaho 280 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 Idaho 155 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 Idaho 1,424 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 Idaho 399 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 Idaho 121 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 Idaho 80 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 Idaho 2,288 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 Idaho 399 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 Idaho 4,487 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

Common in Idaho 205 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

Occasional in Idaho 80 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

Illustration: northern bog lemmings (as Arvicola borealis) from John Woodhouse Audubon's 1845 Northern Meadow-Mouse plate

Northern Bog Lemming

Synaptomys borealis

Rarely seen in Idaho 18 sightings
Size 13 cm5.1 in Weight 21 g0.7 oz active day & night wetland

Sightings by month

Northern Flying Squirrel (Glaucomys sabrinus)

Northern Flying Squirrel

Glaucomys sabrinus

Occasional in Idaho 21 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 Idaho 50 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

Rarely seen in Idaho 11 sightings
Size 13–15 cm5.1–5.9 in Weight 26 g0.9 oz active by night cave

Sightings by month

Live northern montane shrew standing alert on sunlit sphagnum moss with dry grass stems around it

Northern Montane Shrew

Sorex obscurus

Marginal occurrence · 3 records
Size 7.6 cm3 in Weight 7 g0.2 oz active by night montane forest

Sightings by month

Northern pocket gopher in low vegetation

Northern pocket gopher

Thomomys talpoides

Occasional in Idaho 65 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

Marginal occurrence · 6 records
Size 15–28 cm5.9–11 in Weight 140–500 g0.3–1.1 lb active by night urban
Ord's kangaroo rat standing in profile, showing its huge hind feet and long tufted tail

Ord's Kangaroo Rat

Dipodomys ordii

Occasional in Idaho 39 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 Idaho 51 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

Marginal occurrence · 8 records
Size 6–8.5 cm2.4–3.3 in Weight 14–25 g0.5–0.9 oz active by night desert scrub
Pinyon mouse under loose bark showing large ears and long tail

Pinyon mouse

Peromyscus truei

Marginal occurrence · 1 record
Size 10.2 cm4 in Weight 33 g1.2 oz active by night pinyon-juniper woodland

Sightings by month

Piute ground squirrel in profile on a dirt mound in sparse desert scrub

Piute Ground Squirrel

Urocitellus mollis

Common in Idaho 292 sightings
Size 24.5–29.4 cm9.6–11.6 in Weight 82–205 g2.9–7.2 oz active by day great basin desert

Sightings by month

Pronghorn buck standing in a meadow of yellow wildflowers

Pronghorn

Antilocapra americana

Common in Idaho 1,011 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 Idaho 9 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 Idaho 281 sightings
Size 43 cm16.9 in Weight 5–10 kg11–22 lb active day & night desert

Sightings by month

Red-tailed Chipmunk (Tamias ruficaudus)

Red-tailed Chipmunk

Neotamias ruficaudus

Rarely seen in Idaho 8 sightings
Size 23–25 cm9.1–9.8 in Weight 48–62 g1.7–2.2 oz active by day coniferous forest

Sightings by month

Rock squirrel perched on a sunlit boulder

Rock Squirrel

Otospermophilus variegatus

Rarely seen in Idaho 7 sightings
Size 43–53 cm16.9–20.9 in Weight 450–875 g1–1.9 lb active by day lake

Sightings by month

Sagebrush vole partly hidden in low shrub cover

Sagebrush Vole

Lemmiscus curtatus

Occasional in Idaho 65 sightings
Size 11–14 cm4.3–5.5 in Weight 28 g1 oz active day & night shrubland

Sightings by month

Silver-haired bat tucked into loose bark

Silver-haired Bat

Lasionycteris noctivagans

Occasional in Idaho 31 sightings
Size 9.5–11.5 cm3.7–4.5 in Weight 11 g0.4 oz active by night river

Sightings by month

Urocitellus idahoensis artemesiae

Snake River Plains Ground Squirrel

Urocitellus idahoensis

Occasional in Idaho 118 sightings
Size 20–24 cm7.9–9.4 in Weight 100–260 g3.5–9.2 oz active by day shrub-steppe

Sightings by month

Lepus americanus 5459 cropped

Snowshoe Hare

Lepus americanus

Common in Idaho 170 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 Idaho 33 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 Idaho 543 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 · 1 record
Size 12.6 cm5 in Weight 16–20 g0.6–0.7 oz active by night rocky outcrop

Sightings by month

Mephitis mephitis in Dierenpark Zie-ZOO

Striped Skunk

Mephitis mephitis

Common in Idaho 198 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

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

Townsend's Big-eared Bat

Corynorhinus townsendii

Rarely seen in Idaho 12 sightings
Size 5.8 cm2.3 in Weight 9–11 g0.3–0.4 oz active by night coastal

Sightings by month

Taschenratte-Zion-National-Park

Townsend's pocket gopher

Thomomys townsendii

Common in Idaho 284 sightings
Size 18.4 cm7.2 in Weight 190–380 g6.7–13.4 oz active by night river

Sightings by month

Uinta Chipmunk in natural habitat

Uinta Chipmunk

Neotamias umbrinus

Occasional in Idaho 49 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 Idaho 213 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 Idaho 485 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 · 3 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

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 Idaho 116 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

Occasional in Idaho 109 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 Idaho 10 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

Occasional in Idaho 24 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

Occasional in Idaho 34 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

Rarely seen in Idaho 13 sightings
Size 35–45 cm13.8–17.7 in Weight 336–734 g0.7–1.6 lb active by night mixed forest

Sightings by month

Western water shrew at the grassy edge of a stream

Western Water Shrew

Sorex navigator

Common in Idaho 174 sightings
Size 13–17 cm5.1–6.7 in Weight 13 g0.5 oz active day & night river

Sightings by month

White-tailed antelope squirrel showing the pale flank stripe and white tail underside

White-tailed Antelope Squirrel

Ammospermophilus leucurus

Occasional in Idaho 28 sightings
Size 18.8–23.9 cm7.4–9.4 in Weight 97 g3.4 oz active by day pinyon-juniper woodland

Sightings by month

White-tailed Deer (Odocoileus virginianus)

White-tailed Deer

Odocoileus virginianus

Common in Idaho 708 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 Idaho 24 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

Adult wild boar foraging in grass

Wild Boar

Sus scrofa

Marginal occurrence · 4 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

Occasional in Idaho 26 sightings
Size 19–24 cm7.5–9.4 in Weight 299 g10.5 oz active by day montane forest

Sightings by month

Marmota flaviventris (29862435206)

Yellow-bellied Marmot

Marmota flaviventris

Common in Idaho 1,052 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

Occasional in Idaho 106 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 Idaho 3 sightings
Size 8.4–9.9 cm3.3–3.9 in Weight 6 g0.2 oz active by night coniferous forest

Sightings by month