Mammals of Alaska

90 established wild species in Alaska. Plus 15 range-listed species with few or no digitized records.

All species A-Z →

Alaska marmot standing alert on lichen-covered rock above an arctic valley lake in the Brooks Range

Alaska Marmot

Marmota broweri

Occasional in Alaska 61 sightings
Size 60 cm23.6 in Weight 3.2 kg7 lb active by day lake

Sightings by month

Alaskan hare in brown and gray summer coat sitting alert in dry tundra grass

Alaskan Hare

Lepus othus

Occasional in Alaska 106 sightings
Size 57.5 cm22.6 in Weight 2.9–7.2 kg6.4–15.9 lb active by night tundra

Sightings by month

AI-generated image: Aleutian Island Collared Lemming facing forward on dark lava rock in tundra 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

Aleutian Island Collared Lemming

Dicrostonyx unalascensis

Rarely seen in Alaska 43 sightings
Size 13.7 cm5.4 in Weight 58 g2 oz active by night tundra

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 Alaska 584 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

Rarely seen in Alaska 42 sightings
Size 1.9–2 m6.1–6.6 ft Weight 360–1000 kg793.7–2204.6 lb active day & night grassland

Sightings by month

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

American Black Bear

Ursus americanus

Common in Alaska 1,591 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 Alaska 288 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 Alaska 181 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

Occasional in Alaska 213 sightings
Size 33–45.7 cm13–18 in Weight 0.5–1.4 kg1–3 lb active day & night lake

Sightings by month

Tamiasciurus hudsonicus James Gardens

American Red Squirrel

Tamiasciurus hudsonicus

Common in Alaska 2,608 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

Marginal occurrence · 46 records
Size 8 cm3.1 in Weight 8–18 g0.3–0.6 oz active day & night river
Vulpes lagopus in Iceland

Arctic Fox

Vulpes lagopus

Common in Alaska 667 sightings
Size 46–68 cm1.5–2.2 ft Weight 3.5 kg7.7 lb active by day tundra

Sightings by month

Arctic ground squirrel standing alert on a lichen-covered rock above a wide Denali tundra valley

Arctic Ground Squirrel

Urocitellus parryii

Common in Alaska 1,780 sightings
Size 39 cm15.4 in Weight 750 g1.7 lb active by day grassland

Sightings by month

Baird's beaked whales surfacing together in open ocean

Baird's Beaked Whale

Berardius bairdii

Rarely seen in Alaska 17 sightings
Size 9.9 m32.5 ft Weight 11400 kg25132.7 lb active day & night coastal

Sightings by month

AI-generated image: Barren Ground Shrew in side profile on wet mossy ground. 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

Barren Ground Shrew

Sorex ugyunak

Occasional in Alaska 308 sightings
Size 6.9 cm2.7 in Weight 4 g0.1 oz active day & night wetland

Sightings by month

Bearded seal hauled out on flat Arctic sea ice

Bearded Seal

Erignathus barbatus

Common in Alaska 1,946 sightings
Size 2.6 m8.7 ft Weight 283.3 kg624.6 lb active by day coastal

Sightings by month

Wild beluga surfacing in the Churchill River estuary, white back and melon above the water

Beluga

Delphinapterus leucas

Occasional in Alaska 404 sightings
Size 3–5.5 m9.8–18 ft Weight 700–1600 kg1543.2–3527.4 lb active day & night coastal

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 · 3 records
Size 21–30.5 m68.9–100.1 ft Weight 70000–200000 kg154323.7–440924.9 lb active by day estuary
Bowhead whale swimming beside sea ice, photographed from the air

Bowhead Whale

Balaena mysticetus

Occasional in Alaska 108 sightings
Size 14–20 m45.9–65.6 ft Weight 50000–100000 kg110231.2–220462.4 lb active day & night cave

Sightings by month

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

Brown Bear

Ursus arctos

Common in Alaska 4,011 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

Marginal occurrence · 5 records
Size 22.7 cm8.9 in Weight 286 g10.1 oz active by night coniferous forest

Sightings by month

California Myotis (Myotis californicus)

California Myotis

Myotis californicus

Rarely seen in Alaska 38 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

Rarely seen in Alaska 30 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

Occasional in Alaska 354 sightings
Size 48–56 cm18.9–22 in Weight 5–17 kg11–37.5 lb active by night coniferous forest

Sightings by month

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

Caribou

Rangifer tarandus

Common in Alaska 1,901 sightings
Size 1.6–2 m5.3–6.7 ft Weight 80–120 kg176.4–264.6 lb active by day tundra

Sightings by month

Collared Pika - Ochotona collaris (21485563165)

Collared Pika

Ochotona collaris

Occasional in Alaska 471 sightings
Size 18.7 cm7.4 in Weight 129 g4.6 oz active by day alpine

Sightings by month

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

Coyote

Canis latrans

Occasional in Alaska 221 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

Ziphius cavirostris Mar Ligure

Cuvier's beaked whale

Ziphius cavirostris

Rarely seen in Alaska 10 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

Occasional in Alaska 355 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

Elk (Cervus canadensis)

Elk

Cervus canadensis

Rarely seen in Alaska 12 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

AI-generated image: Eurasian Least Shrew beside mossy log on 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

Eurasian Least Shrew

Sorex minutissimus

Rarely seen in Alaska 20 sightings
Size 5.3 cm2.1 in Weight 2 g0.1 oz active day & night coniferous forest

Sightings by month

European rabbit feeding in dry vegetation

European Rabbit

Oryctolagus cuniculus

Occasional in Alaska 155 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

Occasional in Alaska 127 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 Alaska 7 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

Silver-gray wolf walking along a gravel bank in Alaska

Gray Wolf

Canis lupus

Common in Alaska 561 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

Eschrichtius robustus ALM 1702 p1

Grey Whale

Eschrichtius robustus

Occasional in Alaska 144 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

Rarely seen in Alaska 16 sightings
Size 50.6 cm19.9 in Weight 3.4 kg7.5 lb active by day woodland

Sightings by month

Guadalupe Fur Seal (Arctocephalus townsendi)

Guadalupe fur seal

Arctocephalus townsendi

Marginal occurrence · 1 record
Size 1.2–1.9 m3.9–6.2 ft Weight 50–170 kg110.2–374.8 lb active by night cave
Haida ermine in white winter coat standing alert on a mossy log

Haida Ermine

Mustela haidarum

Marginal occurrence · 1 record
active by night grassland
Common seal (Phoca vitulina) 2

Harbor Seal

Phoca vitulina

Common in Alaska 2,237 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 Alaska 137 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

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

Hoary Marmot

Marmota caligata

Common in Alaska 731 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

Rarely seen in Alaska 42 sightings
Size 5–10 cm2–3.9 in Weight 12–30 g0.4–1.1 oz active by night agricultural

Sightings by month

Humpback whale (Megaptera novaeangliae) with calf Moorea 2

Humpback Whale

Megaptera novaeangliae

Common in Alaska 2,892 sightings
Size 12–17 m39.4–55.8 ft Weight 25000–40000 kg55115.6–88185 lb active by day marine

Sightings by month

AI-generated image: Insular Vole sitting upright at burrow entrance among tundra rocks and moss. 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

Insular Vole

Microtus abbreviatus

Common in Alaska 1,407 sightings
Size 14.7 cm5.8 in Weight 58 g2 oz active by day coastal

Sightings by month

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

Keen's Myotis

Myotis keenii

Rarely seen in Alaska 49 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

Marginal occurrence · 1 record
Size 10–11 cm3.9–4.3 in Weight 41–47 g1.4–1.7 oz active by day shrubland
Least Weasel (Mustela nivalis)

Least Weasel

Mustela nivalis

Rarely seen in Alaska 26 sightings
Size 26 cm10.2 in Weight 50 g1.8 oz active by night grassland

Sightings by month

Long-eared myotis peering over weathered wood

Long-eared Myotis

Myotis evotis

Range-listed · no digitized records yet
Size 8.7–10 cm3.4–3.9 in Weight 7 g0.2 oz active by night shrubland
Long-legged myotis roosting on tree bark with wings folded

Long-legged Myotis

Myotis volans

Rarely seen in Alaska 11 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 Alaska 401 sightings
Size 13.5 cm5.3 in Weight 50 g1.8 oz active day & night cave

Sightings by month

Sorex cinereus, Harwich, Chatham, Ontario, Canada 1

Masked Shrew

Sorex cinereus

Common in Alaska 7,338 sightings
Size 6.9 cm2.7 in Weight 5 g0.2 oz active day & night grassland

Sightings by month

Common minke whale (Balaenoptera acutorostrata). Teriberka

Minke Whale

Balaenoptera acutorostrata

Rarely seen in Alaska 23 sightings
Size 7–10 m23–32.8 ft Weight 5000–10000 kg11023.1–22046.2 lb active by day wetland

Sightings by month

Cow moose standing in a marshy Alaska wetland

Moose

Alces alces

Common in Alaska 7,328 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 goat standing on a rocky overlook above Hidden Lake in Glacier National Park with snow-streaked peaks behind

Mountain Goat

Oreamnos americanus

Common in Alaska 852 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

Mule Deer (Odocoileus hemionus)

Mule Deer

Odocoileus hemionus

Common in Alaska 1,068 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

Muskox (Ovibos moschatus) male Dovrefjell 2

Muskox

Ovibos moschatus

Common in Alaska 623 sightings
Size 1.1–1.5 m3.6–4.9 ft Weight 180–400 kg396.8–881.8 lb active by day tundra

Sightings by month

Muskrats resting on a floating log in open water

Muskrat

Ondatra zibethicus

Occasional in Alaska 297 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

Nearctic Brown Lemming (Lemmus trimucronatus)

Nearctic Brown Lemming

Lemmus trimucronatus

Common in Alaska 838 sightings
Size 13.5 cm5.3 in Weight 58 g2 oz active day & night tundra

Sightings by month

Deer Mouse (Peromyscus maniculatus) (9310532204)

North American Deermouse

Peromyscus maniculatus

Occasional in Alaska 457 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 Alaska 964 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 Alaska 436 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

Marginal occurrence · 3 records
Size 15–18 m49.2–59.1 ft Weight 50000–80000 kg110231.2–176370 lb active day & night urban
Illustration: northern bog lemmings (as Arvicola borealis) from John Woodhouse Audubon's 1845 Northern Meadow-Mouse plate

Northern Bog Lemming

Synaptomys borealis

Common in Alaska 829 sightings
Size 13 cm5.1 in Weight 21 g0.7 oz active day & night wetland

Sightings by month

Northern Collared Lemming (Dicrostonyx groenlandicus)

Northern Collared Lemming

Dicrostonyx groenlandicus

Occasional in Alaska 106 sightings
Size 13.7 cm5.4 in Weight 40 g1.4 oz active by night tundra

Sightings by month

Northern Elephant Seal calling

Northern Elephant Seal

Mirounga angustirostris

Marginal occurrence · 7 records
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 Alaska 147 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

Occasional in Alaska 282 sightings
Size 1.9 m6.3 ft Weight 55.5 kg122.3 lb active by night wetland

Sightings by month

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

Northern Montane Shrew

Sorex obscurus

Rarely seen in Alaska 30 sightings
Size 7.6 cm3 in Weight 7 g0.2 oz active by night montane forest

Sightings by month

Northern Red-backed Vole (Clethrionomys rutilus)

Northern Red-backed Vole

Clethrionomys rutilus

Common in Alaska 14,251 sightings
Size 14 cm5.5 in Weight 30–40 g1.1–1.4 oz active by night shrubland

Sightings by month

Northwestern deer mouse eating on a mossy wooden deck at night

Northwestern Deer Mouse

Peromyscus keeni

Common in Alaska 2,084 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

Occasional in Alaska 70 sightings
Size 15–28 cm5.9–11 in Weight 140–500 g0.3–1.1 lb active by night urban

Sightings by month

Killer Whales Hunting a Seal

Orca

Orcinus orca

Common in Alaska 1,143 sightings
Size 5–9.8 m16.4–32.2 ft Weight 2600–10000 kg5732–22046.2 lb active day & night coastal

Sightings by month

Pacific Marten (Martes caurina)

Pacific Marten

Martes caurina

Occasional in Alaska 126 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

Occasional in Alaska 88 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

Marginal occurrence · 2 records
Size 1.5–2.5 m4.9–8.2 ft Weight 85–150 kg187.4–330.7 lb active day & night river
Polar Bear with its tongue sticking out

Polar Bear

Ursus maritimus

Occasional in Alaska 180 sightings
Size 1.8–2.5 m5.9–8.2 ft Weight 150–800 kg330.7–1763.7 lb active by day marine

Sightings by month

AI-generated image: Pribilof Island Shrew in side profile foraging on mossy tundra ground. 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

Pribilof Island Shrew

Sorex pribilofensis

Occasional in Alaska 53 sightings
Size 9.3–9.7 cm3.7–3.8 in Weight 4–5 g0.1–0.2 oz active day & night wetland

Sightings by month

Red Fox (Vulpes vulpes)

Red Fox

Vulpes vulpes

Common in Alaska 784 sightings
Size 43 cm16.9 in Weight 5–10 kg11–22 lb active day & night desert

Sightings by month

Male Ribbon Sea Ozernoy Gulf Russia

Ribbon Seal

Histriophoca fasciata

Occasional in Alaska 97 sightings
Size 1.5 m5 ft Weight 68.3 kg150.5 lb active by day coastal

Sightings by month

Pusa hispida pup

Ringed Seal

Pusa hispida

Common in Alaska 3,194 sightings
Size 1.2 m4 ft Weight 88.1 kg194.2 lb active by day lake

Sightings by month

Risso s Dolphin (Grampus griseus) Catalina (3)

Risso's Dolphin

Grampus griseus

Marginal occurrence · 4 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

AI-generated image: Saint Lawrence Island Shrew in side profile standing in tundra grasses. 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

Saint Lawrence Island Shrew

Sorex jacksoni

Rarely seen in Alaska 4 sightings
Size 6.4 cm2.5 in Weight 5 g0.2 oz active day & night desert

Sightings by month

Sea-otter-morro-bay 13

Sea Otter

Enhydra lutris

Common in Alaska 3,688 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
Silver-haired bat tucked into loose bark

Silver-haired Bat

Lasionycteris noctivagans

Marginal occurrence · 7 records
Size 9.5–11.5 cm3.7–4.5 in Weight 11 g0.4 oz active by night river
Microtus miurus

Singing Vole

Microtus miurus

Occasional in Alaska 300 sightings
Size 9–16 cm3.5–6.3 in Weight 2–3 g0.1 oz active day & night tundra

Sightings by month

Lepus americanus 5459 cropped

Snowshoe Hare

Lepus americanus

Common in Alaska 1,102 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 Alaska 1,481 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 Alaska 53 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

Rarely seen in Alaska 16 sightings
Size 10.7–11 m35–36 ft Weight 13500–57000 kg29762.4–125663.6 lb active day & night urban

Sightings by month

Spotted Seal (Phoca largha)

Spotted Seal

Phoca largha

Common in Alaska 4,066 sightings
Size 1.7 m5.5 ft Weight 93.1 kg205.2 lb active by day wetland

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

Occasional in Alaska 200 sightings
Size 4–5.8 m13.1–19 ft Weight 1000–1800 kg2204.6–3968.3 lb active by day coastal

Sightings by month

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 Alaska 2,506 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 · 2 records
Size 1.8–2.6 m5.9–8.5 ft Weight 100–160 kg220.5–352.7 lb active day & night urban
AI-generated image: Taiga Vole alert on a mossy boreal forest floor, yellow-ochre cheeks visible. 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

Taiga Vole

Microtus xanthognathus

Common in Alaska 1,717 sightings
Size 18.6–22.6 cm7.3–8.9 in Weight 140–170 g4.9–6 oz active day & night wetland

Sightings by month

Dall Sheep (Ovis dalli) (14262651050)

Thinhorn Sheep

Ovis dalli

Common in Alaska 1,339 sightings
Size 1.3–1.8 m4.3–5.9 ft Weight 45–110 kg99.2–242.5 lb active day & night alpine

Sightings by month

Tundra shrew (Sorex tundrensis)

Tundra Shrew

Sorex tundrensis

Common in Alaska 591 sightings
Size 7.5 cm3 in Weight 11 g0.4 oz active day & night tundra

Sightings by month

VOLE, TUNDRA (microtus oeconomus) (9-4-08) gambell, ak -2 (2834490753)

Tundra Vole

Alexandromys oeconomus

Occasional in Alaska 351 sightings
Size 18 cm7.1 in Weight 50 g1.8 oz active day & night tundra

Sightings by month

Three walruses hauled out on Arctic sea ice beside a tall iceberg

Walrus

Odobenus rosmarus

Common in Alaska 3,459 sightings
Size 2.6–3.2 m8.5–10.3 ft Weight 600–1700 kg1322.8–3747.9 lb active day & night urban

Sightings by month

Little brown myotis roosting alertly on a wooden beam

Western Little Brown Myotis

Myotis lucifugus

Common in Alaska 692 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 Alaska 31 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

Marginal occurrence · 1 record
Size 5–7 cm2–2.8 in Weight 2–4 g0.1 oz active day & night montane conifer forest
Western water shrew at the grassy edge of a stream

Western Water Shrew

Sorex navigator

Rarely seen in Alaska 46 sightings
Size 13–17 cm5.1–6.7 in Weight 13 g0.5 oz active day & night river

Sightings by month

Wolverine (Gulo gulo)

Wolverine

Gulo gulo

Occasional in Alaska 261 sightings
Size 17–26 cm6.7–10.2 in Weight 7–18 kg15.4–39.7 lb active by night urban

Sightings by month