Mammals of Oregon

138 established wild species in Oregon. Plus 31 range-listed species with few or no digitized records.

All species A-Z →

AmericanBadger

American Badger

Taxidea taxus

Common in Oregon 264 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 Oregon 3,373 sightings
Size 60–90 cm2–3 ft Weight 11–32 kg24.3–70.5 lb active day & night river

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 Oregon 1,481 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 Oregon 69 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

Common in Oregon 437 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 Oregon 452 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 Oregon 201 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 shrewmole on conifer needles and leaf litter

American Shrewmole

Neurotrichus gibbsii

Common in Oregon 252 sightings
Size 8.1 cm3.2 in Weight 10 g0.4 oz active by day river

Sightings by month

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

American water shrew

Sorex palustris

Occasional in Oregon 86 sightings
Size 8 cm3.1 in Weight 8–18 g0.3–0.6 oz active day & night river

Sightings by month

Wild aoudad standing among dry scrub and rocks with a long chest fringe

Aoudad

Ammotragus lervia

Marginal occurrence · 4 records
Size 0.8–1.1 m2.5–3.6 ft Weight 40–145 kg88.2–319.7 lb active dawn & dusk desert

Sightings by month

Baird's beaked whales surfacing together in open ocean

Baird's Beaked Whale

Berardius bairdii

Marginal occurrence · 1 record
Size 9.9 m32.5 ft Weight 11400 kg25132.7 lb active day & night coastal
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

Common in Oregon 1,263 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

Occasional in Oregon 70 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 Oregon 324 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

Common in Oregon 246 sightings
Size 16–24 cm6.3–9.4 in Weight 75–230 g2.6–8.1 oz active by night agricultural

Sightings by month

Black-tailed jackrabbit (6785302534)

Black-tailed Jackrabbit

Lepus californicus

Common in Oregon 416 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

Live blue whale surfacing with a tall bushy blow spray rising from its blowhole in sunlit open ocean

Blue Whale

Balaenoptera musculus

Marginal occurrence · 4 records
Size 21–30.5 m68.9–100.1 ft Weight 70000–200000 kg154323.7–440924.9 lb active by day estuary

Sightings by month

Bobcat (Lynx rufus)

Bobcat

Lynx rufus

Common in Oregon 1,049 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

Occasional in Oregon 136 sightings
Size 18–27 cm7.1–10.6 in Weight 160–250 g5.6–8.8 oz active day & night woodland

Sightings by month

Brush mouse on a rocky slope

Brush Mouse

Peromyscus boylii

Size 10.7 cm4.2 in Weight 24 g0.8 oz active by night chaparral

Sightings by month

Brush rabbit (23109337569)

Brush Rabbit

Sylvilagus bachmani

Common in Oregon 864 sightings
Size 27–36 cm10.6–14.2 in Weight 0.6–1 kg1.3–2.2 lb active by night coastal

Sightings by month

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

Bushy-tailed Woodrat

Neotoma cinerea

Common in Oregon 858 sightings
Size 22.7 cm8.9 in Weight 286 g10.1 oz active by night coniferous forest

Sightings by month

California ground squirrel perched on a rock

California Ground Squirrel

Otospermophilus beecheyi

Occasional in Oregon 158 sightings
Size 30 cm11.8 in Weight 280–738 g0.6–1.6 lb active by day coastal

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 kangaroo rat among grasses and wildflowers

California kangaroo rat

Dipodomys californicus

Occasional in Oregon 77 sightings
Size 11.5 cm4.5 in Weight 65 g2.3 oz active by night grassland

Sightings by month

California Myotis (Myotis californicus)

California Myotis

Myotis californicus

Rarely seen in Oregon 8 sightings
Size 3–3.5 cm1.2–1.4 in Weight 4 g0.1 oz active by night coastal

Sightings by month

Western red-backed vole ODFW CC

California Red-backed Vole

Clethrionomys californicus

Occasional in Oregon 33 sightings
Size 12.1–16.5 cm4.8–6.5 in Weight 23 g0.8 oz active day & night coniferous forest

Sightings by month

California Sea Lion (Zalophus californianus)

California Sea Lion

Zalophus californianus

Common in Oregon 1,432 sightings
Size 1.7–2.2 m5.7–7.4 ft Weight 110–390 kg242.5–859.8 lb active by night coastal

Sightings by month

Live California vole crouched on bare dirt among small rocks, nibbling a succulent plant

California vole

Microtus californicus

Occasional in Oregon 72 sightings
Size 14.1 cm5.6 in Weight 43–47 g1.5–1.7 oz active dawn & dusk wetland

Sightings by month

Thomomys bulbivorus - Museo Civico di Storia Naturale Giacomo Doria - Genoa, Italy - DSC02780

Camas Pocket Gopher

Megascapheus bulbivorus

Common in Oregon 531 sightings
Size 20–25 cm7.9–9.8 in Weight 150–350 g5.3–12.3 oz active day & night wet prairie

Sightings by month

Lynx Canadensis

Canada Lynx

Lynx canadensis

Marginal occurrence · 2 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

Occasional in Oregon 31 sightings
Size 6.2–8 cm2.4–3.1 in Weight 3–6 g0.1–0.2 oz active by night desert

Sightings by month

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 Oregon 67 sightings
Size 8.4 cm3.3 in Weight 16 g0.6 oz active by night desert

Sightings by month

Central Pacific Jumping Mouse (Zapus montanus)

Central Pacific Jumping Mouse

Zapus montanus

Occasional in Oregon 79 sightings
Size 20–25 cm7.9–9.8 in Weight 18–30 g0.6–1.1 oz active by night wet meadow

Sightings by month

Chisel-toothed kangaroo rat crouched on gravelly desert soil

Chisel-toothed kangaroo rat

Dipodomys microps

Occasional in Oregon 30 sightings
Size 15.6 cm6.1 in Weight 55 g1.9 oz active by night desert

Sightings by month

Coast Mole (Scapanus orarius)

Coast Mole

Scapanus orarius

Occasional in Oregon 78 sightings
Size 12.3 cm4.8 in Weight 62 g2.2 oz active by night coastal

Sightings by month

Columbian ground squirrel Urocitellus columbianus

Columbian Ground Squirrel

Urocitellus columbianus

Common in Oregon 186 sightings
Size 33–41 cm13–16.1 in Weight 350–800 g0.8–1.8 lb active by day montane meadow

Sightings by month

Small group of common dolphins surfacing in choppy water, pale hourglass flank patch visible

Common Dolphin

Delphinus delphis

Marginal occurrence · 4 records
Size 1.6–2.6 m5.2–8.5 ft Weight 70–110 kg154.3–242.5 lb active by night coastal

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 Oregon 2,677 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 Oregon 2,493 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 Oregon 2,855 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

Coypus

Coypu

Myocastor coypus

Common in Oregon 3,579 sightings
Size 40–60 cm15.7–23.6 in Weight 4–10 kg8.8–22 lb active by night river

Sightings by month

Microtus oregoni

Creeping Vole

Microtus oregoni

Occasional in Oregon 143 sightings
Size 10.6 cm4.2 in Weight 19 g0.7 oz active by night river

Sightings by month

Ziphius cavirostris Mar Ligure

Cuvier's beaked whale

Ziphius cavirostris

Rarely seen in Oregon 7 sightings
Size 5–7 m16.4–23 ft Weight 2000–3500 kg4409.2–7716.2 lb active day & night coastal

Sightings by month

Phocoenoides dalli

Dall's porpoise

Phocoenoides dalli

Marginal occurrence · 9 records
Size 1.7–2.4 m5.6–7.9 ft Weight 100–220 kg220.5–485 lb active day & night coastal

Sightings by month

Dark kangaroo mouse on sandy ground at Mono Basin, California

Dark kangaroo mouse

Microdipodops megacephalus

Marginal occurrence · 188 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

Rarely seen in Oregon 8 sightings
Size 17.1 cm6.7 in Weight 113 g4 oz active by night desert

Sightings by month

Douglas's Squirrel (Tamiasciurus douglasii)

Douglas's Squirrel

Tamiasciurus douglasii

Common in Oregon 2,988 sightings
Size 23 cm9.1 in Weight 150–300 g5.3–10.6 oz active by day coastal

Sightings by month

Riparian woodrat neotoma fuscipes riparia endangered mammal species

Dusky-footed woodrat

Neotoma fuscipes

Occasional in Oregon 71 sightings
Size 21.8 cm8.6 in Weight 213 g7.5 oz active by night desert

Sightings by month

Blacklick Woods - Eastern cottontail feeding 1

Eastern Cottontail

Sylvilagus floridanus

Common in Oregon 404 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

Common in Oregon 3,470 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 Oregon 4,566 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

Fallow deer in field

European Fallow Deer

Dama dama

Marginal occurrence · 1 record
Size 1.3–1.8 m4.3–5.9 ft Weight 30–100 kg66.1–220.5 lb active day & night mixed forest

Sightings by month

European rabbit feeding in dry vegetation

European Rabbit

Oryctolagus cuniculus

Common in Oregon 323 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

Two false killer whales bow-riding at speed through breaking white spray

False Killer Whale

Pseudorca crassidens

Marginal occurrence · 3 records
Size 4–6.1 m13.1–20 ft Weight 700–2200 kg1543.2–4850.2 lb active day & night coastal
Fin whale from air

Fin Whale

Balaenoptera physalus

Occasional in Oregon 24 sightings
Size 17–22 m55.8–72.2 ft Weight 40000–80000 kg88185–176370 lb active by day coastal

Sightings by month

Martes Pennanti

Fisher

Pekania pennanti

Occasional in Oregon 32 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

AI-generated image: Fog shrew in side profile on damp forest floor with ferns. 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

Fog shrew

Sorex sonomae

Common in Oregon 903 sightings
Size 7.1 cm2.8 in Weight 6 g0.2 oz active day & night chaparral

Sightings by month

Sciurus niger

Fox Squirrel

Sciurus niger

Common in Oregon 2,701 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

Rarely seen in Oregon 6 sightings
Size 5.4 cm2.1 in Weight 9 g0.3 oz active by night desert

Sightings by month

Gray fox standing in dappled woodland

Gray Fox

Urocyon cinereoargenteus

Common in Oregon 430 sightings
Size 0.8–1.1 m2.5–3.7 ft Weight 3–9 kg6.6–19.8 lb active day & night brushy woodland

Sightings by month

Silver-gray wolf walking along a gravel bank in Alaska

Gray Wolf

Canis lupus

Common in Oregon 189 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

Microtus canicaudus

Gray-tailed Vole

Microtus canicaudus

Rarely seen in Oregon 10 sightings
Size 13–17 cm5.1–6.7 in Weight 30–60 g1.1–2.1 oz active by night grassland

Sightings by month

Great Basin Pocket Mouse peering out from beneath desert shrub leaves

Great Basin Pocket Mouse

Perognathus parvus

Occasional in Oregon 17 sightings
Size 8.2 cm3.2 in Weight 21–22 g0.7–0.8 oz active by night great basin desert

Sightings by month

Eschrichtius robustus ALM 1702 p1

Grey Whale

Eschrichtius robustus

Common in Oregon 445 sightings
Size 11–15 m36.1–49.2 ft Weight 15000–40000 kg33069.4–88185 lb active by day desert

Sightings by month

Guadalupe Fur Seal (Arctocephalus townsendi)

Guadalupe fur seal

Arctocephalus townsendi

Occasional in Oregon 25 sightings
Size 1.2–1.9 m3.9–6.2 ft Weight 50–170 kg110.2–374.8 lb active by night cave

Sightings by month

Common seal (Phoca vitulina) 2

Harbor Seal

Phoca vitulina

Common in Oregon 2,223 sightings
Size 1.4–1.9 m4.6–6.2 ft Weight 55–170 kg121.3–374.8 lb active by day coastal

Sightings by month

Phocoena phocoena.2

Harbour Porpoise

Phocoena phocoena

Occasional in Oregon 59 sightings
Size 1.4–1.9 m4.6–6.2 ft Weight 45–70 kg99.2–154.3 lb active by night coastal

Sightings by month

House mouse in dry plant litter

House Mouse

Mus musculus

Occasional in Oregon 55 sightings
Size 5–10 cm2–3.9 in Weight 12–30 g0.4–1.1 oz active by night agricultural

Sightings by month

Illustration: oil painting of a Hubbs' beaked whale by Jörg Mazur

Hubbs' beaked whale

Mesoplodon carlhubbsi

Marginal occurrence · 2 records
Size 6.2 m20.3 ft Weight 1500 kg3306.9 lb active day & night river
Live Humboldt's flying squirrel perched on pine needles beside a pinecone, feeding with front paws tucked to its mouth

Humboldt's Flying Squirrel

Glaucomys oregonensis

Occasional in Oregon 104 sightings
active by night wetland

Sightings by month

Humpback whale (Megaptera novaeangliae) with calf Moorea 2

Humpback Whale

Megaptera novaeangliae

Occasional in Oregon 58 sightings
Size 12–17 m39.4–55.8 ft Weight 25000–40000 kg55115.6–88185 lb active by day marine

Sightings by month

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

Kit Fox

Vulpes macrotis

Marginal occurrence · 5 records
Size 37–53 cm14.6–20.9 in Weight 1.6–2.7 kg3.5–6 lb active by night desert

Sightings by month

Least Chipmunk in natural habitat

Least Chipmunk

Neotamias minimus

Occasional in Oregon 143 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 · 8 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

Occasional in Oregon 22 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

Rarely seen in Oregon 4 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

Occasional in Oregon 35 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

Common in Oregon 234 sightings
Size 24.8 cm9.8 in Weight 170 g6 oz active day & night wetland

Sightings by month

Illustration: marsh shrew (Bendire's shrew) drawn by Ernest Thompson Seton for Merriam's 1884 original description

Marsh Shrew

Sorex bendirii

Rarely seen in Oregon 12 sightings
Size 9.1 cm3.6 in Weight 15–16 g0.5–0.6 oz active day & night river

Sightings by month

Live Yelm pocket gopher (a Mazama pocket gopher subspecies) peering out of its burrow entrance amid grass, South Puget Sound region of Washington

Mazama pocket gopher

Thomomys mazama

Occasional in Oregon 93 sightings
Size 22.5 cm8.9 in Weight 87–105 g3.1–3.7 oz active by night coastal

Sightings by month

Urocitellus canus

Merriam's ground squirrel

Urocitellus canus

Occasional in Oregon 71 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

Marginal occurrence · 6 records
Size 6.2 cm2.4 in Weight 5 g0.2 oz active day & night desert
Tadarida brasiliensis - Bahamas - Long Island (sic) - Cartwright Cave - March 2006 - 2

Mexican Free-tailed Bat

Tadarida brasiliensis

Rarely seen in Oregon 13 sightings
Size 3.1–4.1 cm1.2–1.6 in Weight 7–12 g0.2–0.4 oz active by night cave

Sightings by month

Common minke whale (Balaenoptera acutorostrata). Teriberka

Minke Whale

Balaenoptera acutorostrata

Marginal occurrence · 5 records
Size 7–10 m23–32.8 ft Weight 5000–10000 kg11023.1–22046.2 lb active by day wetland
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 Oregon 601 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

Occasional in Oregon 32 sightings
Size 14–22 cm5.5–8.7 in Weight 35 g1.2 oz active day & night montane forest

Sightings by month

Live mountain beaver sitting alert on damp grassy ground in daylight

Mountain Beaver

Aplodontia rufa

Occasional in Oregon 136 sightings
Size 38.3 cm15.1 in Weight 500–900 g1.1–2 lb active by night coastal

Sightings by month

Mountain cottontail in dry western woodland edge

Mountain Cottontail

Sylvilagus nuttallii

Common in Oregon 654 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 Oregon 270 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

Common in Oregon 445 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 Oregon 14,477 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 Oregon 593 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 Oregon 5,776 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 Oregon 2,180 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 Oregon 1,098 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

North Pacific Right Whale, Niijima, March 2, 2011 by Aramusha A

North Pacific Right Whale

Eubalaena japonica

Range-listed · no digitized records yet
Size 15–18 m49.2–59.1 ft Weight 50000–80000 kg110231.2–176370 lb active day & night urban
Scapanus latimanus

Northern Broad-footed Mole

Scapanus latimanus

Rarely seen in Oregon 7 sightings
Size 14–18 cm5.5–7.1 in Weight 61 g2.2 oz active day & night desert

Sightings by month

Northern California pocket gopher (Megascapheus laticeps)

Northern California Pocket Gopher

Megascapheus laticeps

Marginal occurrence · 1 record
Size 20–28 cm7.9–11 in Weight 150–400 g5.3–14.1 oz active day & night coastal prairie
Northern Elephant Seal calling

Northern Elephant Seal

Mirounga angustirostris

Occasional in Oregon 108 sightings
Size 3–5 m9.8–16.4 ft Weight 400–2300 kg881.8–5070.6 lb active by day urban

Sightings by month

Northern Flying Squirrel (Glaucomys sabrinus)

Northern Flying Squirrel

Glaucomys sabrinus

Rarely seen in Oregon 14 sightings
Size 25–37 cm9.8–14.6 in Weight 148 g5.2 oz active by night mixed conifer

Sightings by month

Callorhinus ursinus and harem

Northern Fur Seal

Callorhinus ursinus

Rarely seen in Oregon 8 sightings
Size 1.9 m6.3 ft Weight 55.5 kg122.3 lb active by night wetland

Sightings by month

Northern grasshopper mouse walking beside desert grass

Northern Grasshopper Mouse

Onychomys leucogaster

Occasional in Oregon 56 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

Occasional in Oregon 18 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 · 1 record
Size 7.6 cm3 in Weight 7 g0.2 oz active by night montane forest
Northern Pacific Jumping Mouse (Zapus trinotatus)

Northern Pacific Jumping Mouse

Zapus trinotatus

Common in Oregon 632 sightings
Size 20–25 cm7.9–9.8 in Weight 18–30 g0.6–1.1 oz active by night wet meadow

Sightings by month

Northern pocket gopher in low vegetation

Northern pocket gopher

Thomomys talpoides

Occasional in Oregon 37 sightings
Size 22.9 cm9 in Weight 60–160 g2.1–5.6 oz active day & night river

Sightings by month

Anim1749 - Flickr - NOAA Photo Library

Northern Right Whale Dolphin

Lissodelphis borealis

Marginal occurrence · 6 records
Size 2–3.1 m6.6–10.2 ft Weight 60–115 kg132.3–253.5 lb active day & night coastal

Sightings by month

Live Norway rat beside shallow water

Norway Rat

Rattus norvegicus

Occasional in Oregon 160 sightings
Size 15–28 cm5.9–11 in Weight 140–500 g0.3–1.1 lb active by night urban

Sightings by month

AI-generated image: Olympic Shrew foraging among moss and ferns in a damp Pacific Northwest streamside thicket. 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.

Olympic shrew

Sorex rohweri

Size 10–12 cm3.9–4.7 in Weight 5–9 g0.2–0.3 oz active by night streamside thicket
Killer Whales Hunting a Seal

Orca

Orcinus orca

Occasional in Oregon 43 sightings
Size 5–9.8 m16.4–32.2 ft Weight 2600–10000 kg5732–22046.2 lb active day & night coastal

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 Oregon 44 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 Oregon 109 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

AI-generated image: Pacific Shrew in side profile on mossy log beside stream. 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

Pacific Shrew

Sorex pacificus

Common in Oregon 1,769 sightings
Size 7.1 cm2.8 in Weight 6 g0.2 oz active by night lake

Sightings by month

Pacific White-sided Dolphin (Lagenorhynchus obliquidens) - Flickr - gailhampshire

Pacific White-sided Dolphin

Sagmatias obliquidens

Occasional in Oregon 17 sightings
Size 1.5–2.5 m4.9–8.2 ft Weight 85–150 kg187.4–330.7 lb active day & night river

Sightings by month

Pallid bat roosting on a cave wall

Pallid Bat

Antrozous pallidus

Rarely seen in Oregon 7 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

Rarely seen in Oregon 11 sightings
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

Marginal occurrence · 9 records
Size 24.5–29.4 cm9.6–11.6 in Weight 82–205 g2.9–7.2 oz active by day great basin desert
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

Occasional in Oregon 42 sightings
Size 5.5 cm2.2 in Weight 3 g0.1 oz active day & night great basin desert

Sightings by month

Pronghorn buck standing in a meadow of yellow wildflowers

Pronghorn

Antilocapra americana

Common in Oregon 1,169 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

Marginal occurrence · 92 records
Size 23.5–29.5 cm9.3–11.6 in Weight 375–500 g0.8–1.1 lb active day & night great basin desert
Live pygmy sperm whales logging at the sea surface, backs and dorsal fins exposed

Pygmy Sperm Whale

Kogia breviceps

Marginal occurrence · 2 records
Size 2.7–4 m8.9–13.1 ft Weight 320–450 kg705.5–992.1 lb active day & night urban

Sightings by month

Red Fox (Vulpes vulpes)

Red Fox

Vulpes vulpes

Common in Oregon 359 sightings
Size 43 cm16.9 in Weight 5–10 kg11–22 lb active day & night desert

Sightings by month

Red tree vole crouched among Douglas-fir branches

Red Tree Vole

Arborimus longicaudus

Rarely seen in Oregon 15 sightings
Size 10.7 cm4.2 in Weight 22 g0.8 oz active by night coastal

Sightings by month

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

Ringtail

Bassariscus astutus

Occasional in Oregon 23 sightings
Size 30–42 cm11.8–16.5 in Weight 0.7–1.1 kg1.5–2.5 lb active by night urban

Sightings by month

Risso s Dolphin (Grampus griseus) Catalina (3)

Risso's Dolphin

Grampus griseus

Marginal occurrence · 5 records
Size 2.6–4 m8.5–13.1 ft Weight 342.5–460 kg755.1–1014.1 lb active by night coastal

Sightings by month

Rough-toothed dolphin porpoising at the surface of blue ocean water, showing its slender uncreased rostrum and low sloped forehead

Rough-toothed dolphin

Steno bredanensis

Marginal occurrence · 4 records
Size 2.6 m8.5 ft Weight 118.3 kg260.7 lb active day & night river
Sagebrush vole partly hidden in low shrub cover

Sagebrush Vole

Lemmiscus curtatus

Rarely seen in Oregon 7 sightings
Size 11–14 cm4.3–5.5 in Weight 28 g1 oz active day & night shrubland

Sightings by month

Sea-otter-morro-bay 13

Sea Otter

Enhydra lutris

Marginal occurrence · 8 records
Size 34.9 cm13.7 in Weight 1.9 kg4.1 lb active by day coastal

Sightings by month

Sei whale surfacing in deep blue ocean water, small curved dorsal fin visible with a splash at the blowhole

Sei Whale

Balaenoptera borealis

Marginal occurrence · 1 record
Size 12–20 m39.4–65.6 ft Weight 14000–30000 kg30864.7–66138.7 lb active by day urban
Neotamias senex

Shadow Chipmunk

Neotamias senex

Rarely seen in Oregon 6 sightings
Size 14.5 cm5.7 in Weight 67–109 g2.4–3.8 oz active by day coastal

Sightings by month

Short-finned Pilot Whale off Tenerife

Short-finned Pilot Whale

Globicephala macrorhynchus

Range-listed · no digitized records yet
Size 6.1 m20 ft Weight 726 kg1600.6 lb active by night coastal
Silver-haired bat tucked into loose bark

Silver-haired Bat

Lasionycteris noctivagans

Occasional in Oregon 42 sightings
Size 9.5–11.5 cm3.7–4.5 in Weight 11 g0.4 oz active by night river

Sightings by month

Siskiyou Chipmunk iNaturalist

Siskiyou chipmunk

Neotamias siskiyou

Occasional in Oregon 24 sightings
Size 14.5 cm5.7 in Weight 75 g2.6 oz active by day conifer forest

Sightings by month

Lepus americanus 5459 cropped

Snowshoe Hare

Lepus americanus

Common in Oregon 244 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

Common in Oregon 212 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

Occasional in Oregon 175 sightings
Size 22–25 cm8.7–9.8 in Weight 28 g1 oz active by night montane forest

Sightings by month

Sperm whale pod recolored

Sperm Whale

Physeter macrocephalus

Occasional in Oregon 27 sightings
Size 10.7–11 m35–36 ft Weight 13500–57000 kg29762.4–125663.6 lb active day & night urban

Sightings by month

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

Spotted Bat

Euderma maculatum

Marginal occurrence · 2 records
Size 12.6 cm5 in Weight 16–20 g0.6–0.7 oz active by night rocky outcrop

Sightings by month

Illustration: Stejneger's beaked whale, an oil painting of a dark, scarred adult showing the beak and low dorsal fin

Stejneger's beaked whale

Mesoplodon stejnegeri

Marginal occurrence · 3 records
Size 4–5.8 m13.1–19 ft Weight 1000–1800 kg2204.6–3968.3 lb active by day coastal
Leones marinos de Steller (Eumetopias jubatus), Bahía de Aialik, Seward, Alaska, Estados Unidos, 2017-08-21, DD 80

Steller Sea Lion

Eumetopias jubatus

Common in Oregon 711 sightings
Size 2.4–2.9 m7.9–9.4 ft Weight 273–1000 kg601.9–2204.6 lb active by night coastal

Sightings by month

Small group of striped dolphins swimming at the surface in open blue ocean

Striped Dolphin

Stenella coeruleoalba

Marginal occurrence · 8 records
Size 1.8–2.6 m5.9–8.5 ft Weight 100–160 kg220.5–352.7 lb active day & night urban
Mephitis mephitis in Dierenpark Zie-ZOO

Striped Skunk

Mephitis mephitis

Common in Oregon 877 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

Occasional in Oregon 73 sightings
Size 5.8 cm2.3 in Weight 9–11 g0.3–0.4 oz active by night coastal

Sightings by month

Neotamias townsendii

Townsend's Chipmunk

Neotamias townsendii

Common in Oregon 2,029 sightings
Size 15 cm5.9 in Weight 79 g2.8 oz active by day grassland

Sightings by month

Live Townsend's mole in green grass, broad pale forepaw and pointed pink snout visible

Townsend's mole

Scapanus townsendii

Occasional in Oregon 65 sightings
Size 18.6 cm7.3 in Weight 138 g4.9 oz active day & night desert

Sightings by month

Taschenratte-Zion-National-Park

Townsend's pocket gopher

Thomomys townsendii

Occasional in Oregon 59 sightings
Size 18.4 cm7.2 in Weight 190–380 g6.7–13.4 oz active by night river

Sightings by month

Twnsend's Vole 9247a

Townsend's Vole

Microtus townsendii

Occasional in Oregon 82 sightings
Size 15 cm5.9 in Weight 48–73 g1.7–2.6 oz active day & night grassland

Sightings by month

Trowbridge's shrew beside a penny for scale, holding food in its mouth

Trowbridge's Shrew

Sorex trowbridgii

Common in Oregon 732 sightings
Size 6.8 cm2.7 in Weight 4 g0.1 oz active day & night wetland

Sightings by month

Vagrant shrew crossing bare sandy ground

Vagrant Shrew

Sorex vagrans

Common in Oregon 206 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

Common in Oregon 733 sightings
Size 40.8 cm16.1 in Weight 1.1–1.6 kg2.5–3.6 lb active by night river

Sightings by month

Washington Ground Squirrel Pup - Flickr - GregTheBusker

Washington Ground Squirrel

Urocitellus washingtoni

Rarely seen in Oregon 7 sightings
Size 23–28 cm9.1–11 in Weight 120–300 g4.2–10.6 oz active by day shrub-steppe

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

Squirrel, western gray (Sciurus griseus) (8-21-09) Santa Margarita lake, slo co, ca -01

Western Gray Squirrel

Sciurus griseus

Common in Oregon 1,815 sightings
Size 43–91 cm1.4–3 ft Weight 752 g1.7 lb active by day woodland

Sightings by month

Western harvest mouse moving through dry stems and gravel

Western Harvest Mouse

Reithrodontomys megalotis

Rarely seen in Oregon 4 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 Oregon 66 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

Occasional in Oregon 72 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 small-footed myotis roosting on wood with its dark face mask visible

Western Small-footed Myotis

Myotis ciliolabrum

Occasional in Oregon 32 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

Occasional in Oregon 101 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

AI-generated image: White-footed Vole in side profile beside mossy streambank. 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

White-footed Vole

Arborimus albipes

Rarely seen in Oregon 3 sightings
Size 10.8 cm4.3 in Weight 23 g0.8 oz active by night montane forest

Sightings by month

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

White-tailed Antelope Squirrel

Ammospermophilus leucurus

Occasional in Oregon 19 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 Oregon 727 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

Rarely seen in Oregon 3 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

Rarely seen in Oregon 10 sightings
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 · 7 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

Range-listed · no digitized records yet
Size 19–24 cm7.5–9.4 in Weight 299 g10.5 oz active by day montane forest
Marmota flaviventris (29862435206)

Yellow-bellied Marmot

Marmota flaviventris

Common in Oregon 962 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 Oregon 144 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

Common in Oregon 440 sightings
Size 8.4–9.9 cm3.3–3.9 in Weight 6 g0.2 oz active by night coniferous forest

Sightings by month