Mammals of Washington

133 established wild species in Washington. Plus 16 range-listed species with few or no digitized records.

All species A-Z →

AmericanBadger

American Badger

Taxidea taxus

Occasional in Washington 79 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 Washington 2,954 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 Washington 1,862 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 Washington 77 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 Washington 401 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 Washington 2,098 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 Washington 439 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 Washington 371 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 Washington 160 sightings

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

Sightings by month

Atlantic white-sided dolphin leaping clear of the water at Stellwagen Bank, showing the yellow blaze on its tail stock

Atlantic White-sided Dolphin

Leucopleurus acutus

Marginal occurrence · 2 records

Size 2.1–2.8 m6.9–9.2 ft Weight 180–230 g6.3–8.1 oz active day & night continental shelf

Baird's beaked whales surfacing together in open ocean

Baird's Beaked Whale

Berardius bairdii

Size 9.9 m32.5 ft Weight 11400 kg25132.7 lb active day & night coastal

Sightings by month

Big Brown Bats (Eptesicus fuscus)

Big Brown Bat

Eptesicus fuscus

Occasional in Washington 110 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 Washington 516 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

Occasional in Washington 195 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

Occasional in Washington 41 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

Common in Washington 533 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

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

Brown Bear

Ursus arctos

Marginal occurrence · 7 records

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 Washington 68 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 Washington 65 sightings

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

Sightings by month

California Myotis (Myotis californicus)

California Myotis

Myotis californicus

Occasional in Washington 88 sightings

Size 3–3.5 cm1.2–1.4 in Weight 4 g0.1 oz active by night coastal

Sightings by month

California Sea Lion (Zalophus californianus)

California Sea Lion

Zalophus californianus

Common in Washington 1,261 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

Lynx Canadensis

Canada Lynx

Lynx canadensis

Rarely seen in Washington 8 sightings

Size 48–56 cm18.9–22 in Weight 5–17 kg11–37.5 lb active by night coniferous forest

Sightings by month

Canyon bat clinging to weathered tree bark

Canyon Bat

Parastrellus hesperus

Rarely seen in Washington 16 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

Caribú (Rangifer tarandus), Parque nacional y reserva Denali, Alaska, Estados Unidos, 2017-08-30, DD 40

Caribou

Rangifer tarandus

Marginal occurrence · 1 record

Size 1.6–2 m5.3–6.7 ft Weight 80–120 kg176.4–264.6 lb active by day tundra

Cascade golden-mantled ground squirrel - 51356881087

Cascade Golden-mantled Ground Squirrel

Callospermophilus saturatus

Common in Washington 2,466 sightings

Size 28–33 cm11–13 in Weight 170–400 g6–14.1 oz active by day subalpine meadow

Sightings by month

Central Pacific Jumping Mouse (Zapus montanus)

Central Pacific Jumping Mouse

Zapus montanus

Range-listed · no digitized records yet

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

Coast Mole (Scapanus orarius)

Coast Mole

Scapanus orarius

Occasional in Washington 101 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

Occasional in Washington 315 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

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

Rarely seen in Washington 23 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 Washington 3,645 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 Washington 2,469 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 Washington 470 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

Common in Washington 658 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

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

Phocoenoides dalli

Dall's porpoise

Phocoenoides dalli

Occasional in Washington 25 sightings

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

Sightings by month

Douglas's Squirrel (Tamiasciurus douglasii)

Douglas's Squirrel

Tamiasciurus douglasii

Common in Washington 5,602 sightings

Size 23 cm9.1 in Weight 150–300 g5.3–10.6 oz active by day coastal

Sightings by month

Eastern Chipmunk (Tamias striatus)

Eastern Chipmunk

Tamias striatus

Occasional in Washington 26 sightings

Size 16.6 cm6.5 in Weight 93 g3.3 oz active by day urban

Blacklick Woods - Eastern cottontail feeding 1

Eastern Cottontail

Sylvilagus floridanus

Common in Washington 7,732 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 Washington 7,132 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 Washington 2,635 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

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 Washington 405 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

Fin whale from air

Fin Whale

Balaenoptera physalus

Rarely seen in Washington 14 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

Rarely seen in Washington 18 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 Washington 513 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 Washington 14 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

Marginal occurrence · 1 record

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

Silver-gray wolf walking along a gravel bank in Alaska

Gray Wolf

Canis lupus

Occasional in Washington 117 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 Washington 17 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 Washington 54 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 Washington 396 sightings

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

Sightings by month

Groundhog (Marmota monax)

Groundhog

Marmota monax

Marginal occurrence · 6 records

Size 50.6 cm19.9 in Weight 3.4 kg7.5 lb active by day woodland

Guadalupe Fur Seal (Arctocephalus townsendi)

Guadalupe fur seal

Arctocephalus townsendi

Occasional in Washington 30 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 Washington 5,574 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

Common in Washington 491 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

Harp Seal (Pagophilus groenlandicus), Greenland Sea IMG 5032

Harp Seal

Pagophilus groenlandicus

Marginal occurrence · 1 record

Size 1.8 m5.8 ft Weight 141.1 kg311.1 lb active by day coastal

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

Hoary Marmot

Marmota caligata

Common in Washington 2,865 sightings

Size 62–82 cm2–2.7 ft Weight 3.5–10 kg7.7–22 lb active by day lake

Sightings by month

House mouse in dry plant litter

House Mouse

Mus musculus

Occasional in Washington 44 sightings

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

Sightings by month

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

Range-listed · no digitized records yet

active by night wetland

Humpback whale (Megaptera novaeangliae) with calf Moorea 2

Humpback Whale

Megaptera novaeangliae

Common in Washington 516 sightings

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

Sightings by month

Keen's myotis resting on a sunlit rock with wings partly spread

Keen's Myotis

Myotis keenii

Rarely seen in Washington 14 sightings

Size 8–9 cm3.1–3.5 in Weight 6 g0.2 oz active by night coastal

Sightings by month

Least Chipmunk in natural habitat

Least Chipmunk

Neotamias minimus

Occasional in Washington 53 sightings

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

Sightings by month

Long-eared myotis peering over weathered wood

Long-eared Myotis

Myotis evotis

Occasional in Washington 25 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 Washington 43 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 Washington 28 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 Washington 347 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 Washington 9 sightings

Size 9.1 cm3.6 in Weight 15–16 g0.5–0.6 oz active day & night river

Sightings by month

Sorex cinereus, Harwich, Chatham, Ontario, Canada 1

Masked Shrew

Sorex cinereus

Rarely seen in Washington 11 sightings

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

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

Rarely seen in Washington 17 sightings

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

Sightings by month

Merriam's Shrew

Sorex merriami

Occasional in Washington 69 sightings

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

Sightings by month

Common minke whale (Balaenoptera acutorostrata). Teriberka

Minke Whale

Balaenoptera acutorostrata

Occasional in Washington 54 sightings

Size 7–10 m23–32.8 ft Weight 5000–10000 kg11023.1–22046.2 lb active by day wetland

Sightings by month

Montane Shrew

Sorex monticolus

Common in Washington 2,981 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

Rarely seen in Washington 23 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 Washington 706 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

Live mountain beaver sitting alert on damp grassy ground in daylight

Mountain Beaver

Aplodontia rufa

Occasional in Washington 185 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

Occasional in Washington 100 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 Washington 1,367 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 Washington 396 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 Washington 14,639 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 Washington 749 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 Washington 14,644 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 Washington 439 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 Washington 2,361 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

Live North Atlantic right whale head at the surface, rough pale callosity patches visible on the rostrum

North Atlantic right whale

Eubalaena glacialis

Marginal occurrence · 1 record

Size 17.6 m57.8 ft Weight 23000 kg50706.4 lb active day & night coastal

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 Washington 23 sightings

Size 13 cm5.1 in Weight 21 g0.7 oz active day & night wetland

Sightings by month

Northern Elephant Seal calling

Northern Elephant Seal

Mirounga angustirostris

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

Occasional in Washington 60 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

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 Washington 135 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 Washington 9 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

Occasional in Washington 128 sightings

Size 7.6 cm3 in Weight 7 g0.2 oz active by night montane forest

Sightings by month

Northern Pacific Jumping Mouse (Zapus trinotatus)

Northern Pacific Jumping Mouse

Zapus trinotatus

Occasional in Washington 110 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 Washington 56 sightings

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

Sightings by month

Northern Short-tailed Shrew (Blarina brevicauda)

Northern Short-tailed Shrew

Blarina brevicauda

Marginal occurrence · 6 records

Size 11.1 cm4.4 in Weight 21 g0.7 oz active day & night riparian

Northwestern deer mouse eating on a mossy wooden deck at night

Northwestern Deer Mouse

Peromyscus keeni

Common in Washington 3,214 sightings

Size 9.9 cm3.9 in Weight 22 g0.8 oz active by night desert

Sightings by month

Live Norway rat beside shallow water

Norway Rat

Rattus norvegicus

Common in Washington 443 sightings

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

Sightings by month

Olympic marmot (9596419944)

Olympic Marmot

Marmota olympus

Common in Washington 866 sightings

Size 66–76 cm2.2–2.5 ft Weight 3.5–8 kg7.7–17.6 lb active by day subalpine meadow

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

Occasional in Washington 228 sightings

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

Sightings by month

Killer Whales Hunting a Seal

Orca

Orcinus orca

Common in Washington 1,710 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

Dipodomys ordii

Rarely seen in Washington 15 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 Washington 76 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

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

Pacific White-sided Dolphin

Sagmatias obliquidens

Rarely seen in Washington 24 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

Occasional in Washington 57 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

Preble's Shrew

Sorex preblei

Rarely seen in Washington 12 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

Occasional in Washington 54 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 Washington 14 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 Washington 913 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 Washington 15 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

Sagebrush vole partly hidden in low shrub cover

Sagebrush Vole

Lemmiscus curtatus

Rarely seen in Washington 11 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

Common in Washington 353 sightings

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

Range-listed · no digitized records yet

Size 12–20 m39.4–65.6 ft Weight 14000–30000 kg30864.7–66138.7 lb active by day urban

Sika Deer (Cervus nippon)

Sika Deer

Cervus nippon

Size 1.1–1.7 m3.6–5.6 ft Weight 30–90 kg66.1–198.4 lb active by night urban

Silver-haired bat tucked into loose bark

Silver-haired Bat

Lasionycteris noctivagans

Occasional in Washington 68 sightings

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

Sightings by month

Smoky shrew moving through dense green grass

Smoky Shrew

Sorex fumeus

Marginal occurrence · 1 record

Size 7.4 cm2.9 in Weight 8 g0.3 oz active day & night river

Lepus americanus 5459 cropped

Snowshoe Hare

Lepus americanus

Common in Washington 708 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 Washington 134 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

Marginal occurrence · 580 records

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

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

Star-nosed mole's fleshy 22-ray nose organ fanned out, close-up macro

Star-nosed mole

Condylura cristata

Marginal occurrence · 5 records

Size 12.1 cm4.8 in Weight 52 g1.8 oz active day & night urban

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 Washington 933 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

Mephitis mephitis in Dierenpark Zie-ZOO

Striped Skunk

Mephitis mephitis

Occasional in Washington 214 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 Washington 48 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 Washington 1,762 sightings

Size 15 cm5.9 in Weight 79 g2.8 oz active by day grassland

Sightings by month

American Souslik (Spermophilus Townsendii), Oregon Meadow-Mouse (Arvicola Oregoni) and Texan Meadow Mouse (Arvicola Texiana) from the viviparous quadrupeds of North America (1845) illustrated by John

Townsend's Ground Squirrel

Urocitellus townsendii

Occasional in Washington 45 sightings

Size 21–26 cm8.3–10.2 in Weight 130–300 g4.6–10.6 oz active by day shrub-steppe

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 Washington 53 sightings

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

Sightings by month

Twnsend's Vole 9247a

Townsend's Vole

Microtus townsendii

Occasional in Washington 85 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 Washington 744 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

Occasional in Washington 162 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 Washington 770 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 Washington 22 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

Occasional in Washington 58 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 Washington 15 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

Rarely seen in Washington 4 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 Washington 33 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

Rarely seen in Washington 18 sightings

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

Sightings by month

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 Washington 10 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 Washington 7 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

Rarely seen in Washington 3 sightings

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

Sightings by month

White-tailed Deer (Odocoileus virginianus)

White-tailed Deer

Odocoileus virginianus

Common in Washington 1,195 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 Washington 7 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

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

Occasional in Washington 30 sightings

Size 17–26 cm6.7–10.2 in Weight 7–18 kg15.4–39.7 lb active by night urban

Sightings by month

Marmota flaviventris (29862435206)

Yellow-bellied Marmot

Marmota flaviventris

Common in Washington 1,583 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 Washington 1,139 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 Washington 17 sightings

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

Sightings by month