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I worked for a few seasons in Alaska, and in my time in the state, I saw many types of mammals, including killer whales, humpback whales, and bears. I wanted to find out which mammals live in Alaska, so I put together this guide.

Alaska has some of the best wildlife on the planet. Humpback whales come here to feed in summer, and many other marine mammals live or migrate through the region. Alaska has over one hundred species of mammals living on land or in the surrounding waters. The moose is the state mammal of Alaska.

Read on if you want to find out which mammals live in Alaska.

Would you like to know what your state mammal is? Find out in this article I wrote.

Alaskan Hare

The Alaskan hare is also known as the tundra hare and is found in the tundra regions of western Alaska and the Alaska Peninsula. 

They usually measure about 50 to 70 centimeters in length, with a tail of approximately 8 cm, and can weigh between 2.9 and 7.2 kilograms. 

Alaskan hares are solitary during the year, apart from the mating season. These hares do not live in caves but nest in open sites. They usually live in brushy areas that provide camouflage and protection from predators. 

They are herbivores and usually forage at dawn and dusk. The ears of this species are critical in thermoregulation, with smaller ears preventing heat loss in cold climates.

Alaska Marmot 

The Alaska marmot is also known as the Brooks Range marmot or the Brower’s marmot, and they can be found on the slopes of the Brooks Range in Alaska. 

The Alaska marmot feeds mainly on plants, grass, berries, moss, lichen, and roots. 

They are sometimes hunted for their warm fur and as food by the Alaskan natives. 

The Alaska marmot can range from 54 cm to 65 cm in length and weigh up to 4 kilograms. 

Arctic Fox

The Arctic fox lives in some of the harshest conditions on Earth. They live in the Arctic regions of North America, in frigid temperatures, and have adapted well to their surroundings.  

They are small, with a body length of up to 68 cm and a weight of 3.5 kg, with females slightly smaller at 55 cm and 2.9 kg.  

Arctic foxes have thick white fur in the winter, which helps to keep them warm and camouflaged against the snow. They curl up to minimize heat loss, tucking their head and legs under their body and tail.  

Arctic foxes live in dens which helps minimize heat loss from the Arctic wind. The holes are southward facing to make the cave warmer from the sun.  

The main diet for the arctic fox is lemmings, although they will eat small animals, including hares, fish, birds, voles, bird eggs, and carrion.

Arctic Ground Squirrel

The Arctic ground squirrel is a squirrel that lives on the ground instead of the trees. They live in the northern regions of North America. 

Their color is gray, scattered with small white spots, or brown with tan spots. They measure about 39 cm and weigh from 750 to 850g. 

This species of squirrel is a herbivore eating grass, sedges, mushrooms, roots, leaves, flowers, and seeds. 

Utah prairie dog

They live in the tundra, forest clearings, grasslands, and river valleys, with a lifespan of 7 to 10 years.

Arctic Hare

The Arctic hare is a species of a hare that has adapted to live in the Arctic tundra and icy cold environments. 

The fur of the Arctic hare is thick, and they usually dig holes under the snow to keep warm. This species can thrive in frigid temperatures and might travel with other individuals but typically live solitary lives. 

They usually measure about 43 to 70 centimeters in body length and can weigh up to 7 kilograms, although typically their weight ranges between 2.5 and 5.5 kilograms. 

Arctic hares are found in the northern parts of Greenland, Alaska, the Canadian Arctic Islands, and Northern Canada. The Arctic hare is usually herbivorous, feeding primarily on woody plants and willow.

Arctic Shrew

The Arctic shrew is a midsize, solitary mammal from the northern regions of North America. 

Their colors are dark brown on the back, lighter brown on the sides, and grayish-brown on the underbody. They measure from 7.5 to 12 cm and weigh 5 to 13 g. 

This insectivore eats insects and small invertebrates. They live in open areas near wetlands, clearings in snow forests, and conifer swamps. Their lifespan is just 18 months.

Barren ground Shrew

The barren ground shrew can be found in Alaska and northern Canada. They have grayish-brown sides with dark brown bodies.

They grow up to 8cm in length, weighing 4g.  

The barren ground shrew is related to the St Lawrence Island Show and the Pribilof Island shrew.

Bearded Seal 

The bearded seal is also known as the square flipper seal. They are a medium-sized seal species native to the Arctic Ocean. 

They can be found in a wide range, from Bristol Bay on the Alaskan coast to the Sea of Okhotsk on the Russian Coast. They can also be found in Canada, Norway, and Japan. 

These earless seals are grayish-brown and darker on the back. Females of this species are more significant than males. On average, bearded seals measure about 2.1 to 2.7 meters in body length, and their mass body spans between 200 to 430 kilograms. 

The bearded seal is a significant food source for polar bears. These seals feed primarily on small marine species including clams, squid, and fish.


The North American beaver can reach up to 32 kg, with 20 kilograms being the average weight. They can measure 74-90cm, excluding the tail, adding 25-30 cm. 

The beaver is the largest rodent in North America and is semi-aquatic. They have a transparent third eyelid allowing them to see underwater. 

Beavers play an essential role in the environment and are keystone species. They are well known for building dams, canals, and lodges. They construct dams to flood areas to obtain access to food and protection.

They live in colonies and have orange teeth due to the amount of iron they contain. This makes their teeth stronger than regular teeth.

The beaver is a herbivore and eats bark, cambium, roots, buds, and water plants. The North American beaver lives in forests (near water bodies) in northern North America, with a lifespan between 10 to 15 years. 

Beluga Whale

The beluga is easy to spot due to its almost pure white, yellowish or pale gray color. They have no mottling on either side. 

Beluga whales grow from 9.8-18 ft (3-5.5m) with a weight of 1,100-3,500 lbs. They have a gestation period of 12-14.5 months and give birth to one calf. 

Beluga whales eat a wide variety of fish, squid, octopus, and mollusks. 

They change color as they age, with a pale gray at birth, then dark-brown to brownish-gray, then utterly white at the age of ten. 

They can be seen close to shore and, when stranded, can generally survive until the tide comes back in.

Whale calf feeding

Big Brown Bat

The big brown bat is an insectivore that eats beetles primarily but also consumes other flying insects like moths, flies, and wasps.

They live in all types of habitats, with a lifespan ranging from 18 to 20 years. This animal carries a lot of diseases, including rabies and parasites such as tapeworms and fleas.

The big brown bat is a small, nocturnal flying mammal. They live in colonies and use echolocation to locate objects while flying at night. The color varies from brown to black. 

They measure 11 to 13 cm, with a wingspan from 32 to 40 cm, weighing 15 to 26 g.

The species of bats live in North America and the Caribbean.


The American bison is a large species of mammal from North America. They are also commonly called the American buffalo, although this is not entirely correct. 

Their color is dark brown and gets darker in summer and lighter in winter. They measure from 2 to 2.8 m and weigh from 318 to 1,000 kg. 

The bison is a herbivore and eats grasses and sedges. They live in river valleys, grasslands, semi-arid lands, prairies, and plains. 

Their lifespan is 15 years in the wild and 25 years in captivity. They are no longer classed as an endangered species.

Black Bear

The American black bear is a midsize mammal from North America. Their color is not always black but can be brown, tan, or even blonde. 

They measure from 130 to 190 cm and weigh 200 to 300 kg. The black bear is an omnivore and has a varied diet. This consists mainly of fish, mammals, insects, grasses, roots, and berries. 

This black bear is broadly distributed in forest habitats, with an average lifespan of twenty years.

Blue Whale

The blue whale is the largest living animal to live on Earth, not just now but throughout history. 

This species of whale reaches sizes between 69-95 ft (21-29m), although they are slightly smaller in the Northern Hemisphere. 

Females are more significant than males and can reach incredible weights of 90-150 tons. 

The diet of a blue whale consists mainly of krill, with some crab and squid. They are easy to spot because of their vast size and can be distinguished by their flattened, broad, u-shaped head. 

Even though they are so large, they have a tiny dorsal fin that is set far back.

Bowhead Whale

The bowhead whale grows between 45-65 ft (14-20m) and weighs between 65 and 110 tons. Female whales are more significant than males.

Bowhead whales live mainly on krill, copepods, and other small and medium-sized crustaceans. 

They are a slow swimmer but can breach, flipper-slap, bobtail, and spy hop. They give birth to a single calf after a gestation period of 13-14 months.

Bowhead whales are named for their enormous, distinctive bow-shaped skull. They are well adapted to life in their freezing home and can break through the ice to create breathing holes.

Brown Bear

The brown bear is a large mammal that lives in northern regions. They are also known as grizzly bears. 

Their color ranges from dark brown to light yellowish-brown. They measure from 1.4 to 2.8 m and weigh 152 to 217 kg. 

Grizzly bears are omnivores and will eat roots, fruit, grass, insects, carcasses, and fish. 

They live in many habitats, including mountain forests, ice fields, and the edges of deserts. Their lifespan is twenty to thirty-five years.

Brown Lemming

The brown lemming is characterized by its brown-colored fur and reddish rump. During the wintertime, the coat becomes thicker and grayer with longer hairs. 

On average, the brown lemming weighs 58-68g and grows up to 12.5-13 cm in length. Male individuals are usually bigger than females. 

Brown lemmings can be found in the tundra in a wide variety of areas spanning from Northern Canada to Alaska. 

Brown lemmings mainly live underground and feed on moss. They do not migrate and fight among themselves during the mating season to protect their territory.

Bushy-Tailed Woodrat

The bushy-tailed woodrat is a rodent from the western regions. Their color is brown, with small black spots and white on the underbody. 

The bushy-tailed woodrat measures 28 to 46 cm (including the tail) and weighs about 590 g. 

This omnivore eats grasses, leaves, cacti, twigs, nuts, needles, seeds, mushrooms, arthropods, and shoots. 

They live in rocky places like cliffs, canyons, or rocky slopes. Their lifespan is 5.8 years in captivity.

California Myotis

The California myotis is a species of vesper bat found in British Columbia in Canada and the western regions of the United States. 

They are small-sized bats, usually measuring around 70 to 94 mm in length and weighing about 3.3 to 5.4 grams. 

Their fur is pale and dull colored. They have medium-sized ears and tiny feet. A lighter face mask than other bats characterizes them. 

The California myotis usually roost in the bark of trees or rock crevices. They fly at a relatively slow speed compared to other species of bats.

California Sea Lion

The California sea lion is a species of eared seal native to the western regions of North America. 

Their habitat ranges from southeast Alaska to central Mexico and includes the Gulf of California. 

Males are more significant than females, with males weighing up to 350 kilograms while females up to 100 kilograms. 

California sea lions can be found laid out on sandy or rocky beaches. 

They feed on fish and various squid species but must be wary of predators, including killer whales and great white sharks. 

California sea lions are particularly intelligent.

Canada Lynx

The Canada lynx is a daily and solitary wildcat. Their paws have thicker so that they can travel through snow. 

Their color ranges from grayish-yellow to reddish-brown, and they have a black mark on the tip of their ears and tails. 

They measure from 76 to 110 cm and weigh 8 to 18 kg. They usually live in cold, dense forests, with a lifespan of 15 years.

This carnivore eats mostly snowshoe hares and feeds on birds, fish, rats, and sometimes deer.


The caribou is a reindeer living in the northern regions of North America. 

Their color changes throughout the year from dark brown in summer to grayish-brown in winter. 

They measure from 1 to 1.2 m at the shoulder and weigh 110 to 210 kg. 

Caribou are herbivores.  They eat sedges, leaves, grasses, and mosses. They find these in the boreal forests which they call home.

Their lifespan is 10 to 15 years, and are classed as an endangered species.

Collared Pika 

The collared pika is found in southern Alaska, the Yukon, and parts of Canada, including British Columbia. 

They are small-sized animals, weights 160 grams on average, and measure 17.8 to 19.8 centimeters in length. T

The dorsal side of their body is grayish, and patches on their shoulders and nape create a different collar from which the name comes. 

Collared pikas are mainly found in mountainous regions and typically inhabit rock slides near vegetation and meadows. They use the rocks to protect them from the high temperatures they experience during the day. They are mainly diurnal and herbivores.

Common Shrew 

The masked shrew, al, known as the cinereus shrew and common shrew, is a small, nocturnal, and solitary animal. 

Their color is grayish-brown, with a lighter grayish color on the underbody. They measure just 9 cm, with a weight of 5g. 

Masked shrews are carnivores eating insect larvae, ants, grasshoppers, crickets, spiders, worms, snails, small rodents, and salamanders. 

They live in grasslands, forests, riverbanks, lakeshores, and tundra in the northern part of North America. Their lifespan is 14 months.


The cougar is a solitary, elusive, and primarily nocturnal wildcat. They are also known as the puma, mountain lion, and catamount. 

Their color is grayish-brown with white on the underbody. Cougars measure about 2.4 m long (including a long tail) and weigh 53 to 100 kg. 

Photo of cougar

Cougars are carnivores with their main prey being deer. They will also prey on elk, coyotes, mountain goats, beavers, moose, and wild sheep. More petite cougars will prey on smaller mammals than larger cougars. 

They can live in an enormous range of habitats in North America. They have a lifespan that ranges between 8 to 13 years.


The coyote is a midsize canine with the look of a domestic dog and is thinner and smaller than the gray wolf. Their color is grayish-brown with a white underbody. 

Coyotes measure about 1.5 m (including the tail) and weigh 6.8 to 21 kg. Their lifespan ranges from ten to fourteen years in the wild and up to twenty-one years in captivity.

Coyotes are adaptable and have an extremely varied omnivorous diet. Their diet includes cactus fruits, flowers, insects, rodents, rabbits, birds, and reptiles. 

They can be found in most habitats across North America.

Cuvier’s Beaked Whale 

Cuvier’s beaked whales grow between 18-23 ft (5.5-7m) with a weight between 2.2 – 3.9 tons. 

They feed on squid, fish, and crustaceans. They generally have scarring and shark bites on a gray or reddish-brown body. A sloping forehead and a hollow head can recognize them. 

Cuvier’s beaked whales are known to breach. They will generally try to avoid incidents with boats, although they are one of the most-watched beaked whales. 

Although they may be seen alone, groups of up to seven may travel together. Groups of 25 have been seen together, although this is rare.

Dall Sheep

Dall’s sheep can be found in northwestern North America. Dall’s sheep can be found in the northern regions, whereas the subspecies stone’s sheep can be found in the more southerly part.

They range from white to brown and have long curved horns. They live in mountainous regions on steep slopes and surrounding meadows. The terrain allows them to escape up steep slopes from predators.  

Dall’s sheep eat plants in summer, but when food is scarce in winter, they eat grasses and sedges.  

Dall’s sheep can be seen licking minerals from rocks in the spring.

Dall’s Porpoise 

The Dall’s porpoise is a swift swimmer and will bow-ride alongside a ship. They rarely breach the water. 

They grow from 5.6-7.9ft (1.7-2.4m) and weigh between 300-400 lb. They have a small, stocky shape with black and white markings. This species has a white edge to its dorsal fin, which is in the center of its dorsal. 

They can be seen in Alaska, Aleutian Island, San Juan, Olympic Coast, Vancouver Island, California, and Baja, California.

Deer Mouse 

The deer mouse is a small and reclusive rodent. Their color (which resembles that of a deer) varies from gray to brown, with a white underbody. 

They measure 8 to 10 cm (without the tail) and weigh about 20g. 

The deer mouse is an omnivore feeding on various foods, such as seeds, nuts, fruits, and insects. 

They live in many habitats, including forests, mountains, deserts, grasslands, and tropical regions throughout most of North America. 

Their lifespan is eight years in captivity and less than a year in the wild. They can carry viruses and bacteria that cause human diseases, such as Hantavirus Pulmonary Syndrome (HPS).

The forest deer mouse also lives in Alaska.

Dusky Shrew

The Montane shrew is a species of mammal known as the dusky shrew. 

They can be found in Alaska, Western Canada, and the western areas of the United States, including Washington, Idaho, Montana, Utah, Colorado, New Mexico, Arizona, Oregon, Nevada, and California. 

They are about 95 to 116 mm long in total body length and weigh approximately 4.4 to 10.2 grams. 

The Montane shrew occupies vast niches of moist, grassy areas, usually river banks and meadows. 

Their habitat consists of coniferous forests, including taiga, high mountain subalpine, and alpine forests. 

Montane shrews molt twice a year. Their pelage is commonly brown or gray, but the coloration depends on the elevation.

Elephant Seal

The Northern elephant seal is one of two species of sea elephants alive. Their name comes from their large size and the beak that characterizes males of this species, which is used to make loud roaring noises, especially during mating. 

Their dimensions are typically about 4 to 5 meters in body length for males, while females measure about 2.5 to 3.5 meters. Males usually weigh about 1500 to 2300 kilograms, while females range between 400 to 900 kilograms.  

Males are much bigger than females, and a booming male can impregnate up to 50 females in one season. 

Northern elephant seals live in the eastern Pacific Ocean and spend most of their time underwater. They can be found in British Columbia, California, and Baja, California. 

Some significant colonies are found in several Pacific Islands in the United States and Mexico. They primarily feed on fish and squid.


The elk is one of the most prominent members of the deer family. They live in the United States and southern Canada.  

Their color varies from tan to dark brown. They measure from 2.1 to 2.4 m in length and weigh between 220 to 330 kg. 

The elk is a herbivore that eats grass, leaves, bark, and brushwood. They live mainly in forests and have an expected lifespan of ten to thirteen years in the wild.

European Rabbit

The European rabbit is a small rabbit measuring 40 cm in length with a weight of 2.6-4.4 lb. Their ears are large, measuring between 6.5-7.5 cm in length.  

The European rabbit comes in various colors but is generally grayish-brown with hairs of black, gray, or red on the body.  

They are born with a white star shape on their foreheads, but this fades by adulthood. They live in warrens with up to ten other rabbits.  

Fin Whale 

The fin whale is a giant growing between 59-88 ft (18-27m), although slightly smaller in the Northern Hemisphere. They reach a weight between 34-100 tons. 

There are several thousand fin whales off the West Coast of America. 

They have different pigmentation on their heads on both sides, which is rare for any whale. This is said to confuse their prey. 

They are the second-largest living animal on Earth after the blue whale. 

Populations of the fin whale can be seen almost year-round in the Gulf of California and British Columbia.


The fisher is a small, solitary, mainly nocturnal, aggressive, and elusive weasel. They are related to the American marten. 

Their color varies from dark brown to black, with a lifespan of seven years in the wild and, in rare cases, up to 14 years in captivity. They measure from 75 to 120 cm and weigh 2 to 6 kg. 

The fisher is a carnivore that eats mice, snowshoe hares, birds, cats, poultry, shrews, porcupines, and squirrels. 

Even though they move on the ground most of the time, they are also an excellent climber. 

They live in forests in the southern part of Canada and the northern and western parts of the United States.  


Glacier Bay Water Shrew 

The Glacier Bay water shrew is a species of water shrew. They can swim underwater and run across the water due to the tiny hairs on their feet.  

The Glacier Bay water shrew is a small species of shrew. They live around the flats around Glacier Bay.

Gray Whale

The gray whale grows between 46-49 ft (11-15m) and reaches a weight between 18-40 tons. Females produce larger than males. 

Their diet consists of schooling fish, crabs, amphipods, and mysids. They frequently approach whale-watching boats and have lots of surface activity. 

They give birth to a single calf after a gestation period of 12-13.5 months. 

They migrate considerably, sometimes up to 12,400 miles, to journey between their feeding and breeding grounds.

Gray Wolf

The gray wolf is a social canine living in North America’s northern regions. 

The colors of the gray wolf vary greatly depending on their location. They can be gray, brown, black, tan, or white. However, the predominant color is gray. The underbody is usually lighter and sometimes white. 

Gray wolves measure from 1.05 to 1.60 m and weigh 12 to 79.4 kg. 

Gray wolves are carnivores eating a wide variety of meat. Gray wolves eat deer, beavers, boar, mountain goats, bison, elk, moose, birds, fish, rodents, and hares. 

They live in many habitats, including mountains, grasslands, forests, tundra, and deserts. 

Their lifespan is six to thirteen years in the wild and seventeen years in captivity.

Harbor Porpoise 

The harbor porpoise is a small, shy, elusive marine mammal relative to dolphins. 

The harbor porpoise grows from 4.3-6.6ft (1.3-2m) and weighs 110-165 lb. 

They are dark on their dorsal side and lighter underneath. They have a small, indistinct beak and one or more stripes from their mouth to the flipper. 

The harbor porpoise is a carnivore and mainly eats fish and sometimes octopuses and squids. 

They like to swim in shallow bodies of water and even frequent inland water bodies, such as rivers and estuaries.

They can be found in the Pacific Ocean in Alaska, Aleutian, Pribilof Island, San Juan Islands, Westport, the Olympic Coast, California, and Vancouver Island. They can also be seen around Newfoundland and the St Lawrence River.

Their average lifespan in the wild is about 20 years.

Harbor Seal

The harbor seal is also known as the common seal. Their color is brownish gray with light or dark spots, and the color is lighter on the underbody. 

They measure 1.85 m and weigh from 55 to 168 kg. 

They are carnivores and eat squid, crustaceans, shrimp, crab, mollusks, and fish. 

They live in the harbors on both the east and west coasts of the northern regions of North America. 

They can usually be found in rocks, beaches, and glacier ice, rarely moving from too far. However, they will rush to deeper water if there is a danger. 

They are an excellent swimmer and have a lifespan of 20 to 35 years.

Harp Seal

The harp seal is a species of earless seal. They can be found in the Atlantic Ocean and the Arctic Ocean.  

The harp seal has silver-gray fur with black spots and jet-black eyes. They grow from 1.7 to 2.0m and weigh from 115 to 145 kg.  

Unlike other seals, the harp seal can dive too deep depths. They have been spotted at over 500m deep and can hold their breath for up to twenty minutes. Dive depth increases in winter when there is less food at shallow depths.

Hoary Marmot

The hoary marmot is a marmot species with a body length ranging from 62 to 82 cm and a body weight of around 3.75 kg. In winter, a fully developed adult can reach a weight of up to 7 kg. 

Inhabiting the mountains of Northwest America, the hoary marmot lives on slopes with grass and around rocky areas that protect them from predators. 

They have often been nicknamed the whistler due to the high-pitched alarm calls that warn other colony members of possible danger. 

This species of marmot is more significant than most, with short, heavy limbs.

Hooded Seal

The hooded seal gets its name from an inflatable bladder on the head of the male. The bladder hangs over the eyes and the lips when deflated.  

They can inflate the bladder before diving underwater. They can then grow and deflate the bladder as they are swimming. The hooded seal can use the inflated sac when swimming to ward off other species when it feels threatened.  

Males have a membrane that comes out of the left nostril that produces sounds that they use to attract a mate, but mainly for signaling acoustically.

The inflatable bladder is used for acoustic signaling, threatening other species when competing for food. The bladder also communicates information about its status and health to other species members.

The nostril membrane produces different sounds when shaken underwater or on land. These signals can be used for sexual purposes to attract a mate but mainly for acoustic situations and signaling.

Only males have the hood, which they develop at four. Females do not grow the bladder.

House Mouse

The house mouse is a secretive and cautious mouse that is sometimes domesticated. 

Their color is gray, black, or brown, with a lighter underbody. They measure from 7.5 to 10 cm (including the tail) and weigh 40 to 45g. 

The house mouse is an omnivore eating meat, fruits, seeds, and grains. They tend to live in places where humans live. 

Their lifespan is less than one year in the wild but can be between 2 to 3 years in protected environments.

Humpback Whale

The humpback whale grows between 46-56 ft (14-17m), weighing 28-45 tons. 

They approach whale-watching boats and are very interested. They are popular with whale watchers due to their breaching, lobtailing, spy hopping, and flipper-slapping. 

They have a gestation period of 11-12 months and give birth to one calf. 

They can be seen in many places in North America, with Hawaii, British Columbia, and Alaska as the perfect places to spot them.

Humpback whale

Keen’s Myotis

Keen’s myotis can be found in the northwest part of the United States and British Columbia in Canada.  

As with most bats, they are insectivores feeding on moths and beetles.  

Keen’s myotis can be found around the coast, although they are becoming more common in urban areas.

They have a body length of 9cm with a tail length of 5cm. Keen’s myotis is a species of long-eared bat.

Killer Whale 

The killer whale is also commonly known as the Orca, a name taken from its binomial name of Orcinus orca.  

Killer whales are the most prominent members of the dolphin family, growing from 6 to 8 meters long and weight 5.9 tons. Females are smaller than males.  

They are one of the fastest marine mammals due to their size and incredible strength, reaching speeds up to 56 km/h. They have a black upper side with a white underside.

Least Weasel

The least weasel is also known as the common weasel or little weasel. They are the smallest member of the genus Mustela. 

They are native to North America but also Eurasia and North Africa. Their bodies are slender and elongated, with relatively short tails and legs. 

The average body length is around 130 to 260 mm, and they weigh 36 to 250 grams, with males slightly more significant than females. 

The color of the pelage of least weasels varies according to the geographical location, but underparts are usually white, and the back, limbs, and tail are a shade of brown. 

Their diet consists mainly of small rodents. Males mark their territory with olfactory signs and are strongly territorial and dominant weasels. 

At least weasels may have aggressive encounters with each other. The least weasel occupies a wide range of different habitats.

Little Brown Bat 

The little brown bat is a small North American bat. Their colors vary from light tan to dark brown, with more golden color on their underbody. 

The little brown bat measures 8 to 9.5 cm and weighs 5.5 to 12.5g. 

This insectivore eats mosquitoes, moths, and beetles. The little brown bats live in most of North America. 

They will find any place to roost during the day, such as trees, caves, and rocks. In winter, this bat hibernates in caves. Their lifespan is from 6 to 7 years.

Long-Legged Myotis

The long-legged myotis is a species of vesper bat that usually inhabits the western regions of Canada and the United States. They can also be found in Mexico. 

They are the second-largest species of myotis found in the United States. Their wingspan is about 24 to 50.8 centimeters long, and their average body mass is 7.5 grams. 

They are characterized by light-brown to chocolate-brown pelage and short, rounded ears. They are also distinguishable from other bat species by the fur underside of their wings, which extends to their elbows and knees.

Long-Tailed Vole

The long-tailed vole is a rodent characterized by short ears and a long tail. Usually, they measure around 18 cm in length with an 8-10 cm long tail and weigh approximately 50 grams. 

The long-tailed vole is a rodent found in different habitats, often near streams. They also live at high elevations (more than 3,500 meters above sea level) and inhabit a wide area. 

Their range extends north to east-central Alaska, the western Canadian Provinces, and south to the United States, including California, Arizona, Colorado, New Mexico, and Wyoming. 

The long-tailed voles are active all year round and are mainly diurnal.


The American marten is a small, solitary, and nocturnal member of the Mustelidae family. 

Their color ranges from yellowish-brown to black. They measure 32 to 54 cm and weigh from 0.5 to 1.3 kg.  

American Marten

The American Marten eats smaller animals, such as squirrels, birds, and mice, but will also eat fruits and nuts. 

They are widely scattered in northern, mature conifer forests throughout the continent. They can be found on the ground and in trees, with an estimated lifespan of fewer than fifteen years.

Meadow Jumping Mouse 

The meadow jumping mouse is a solitary and primarily nocturnal North American rodent. They can jump 8 feet or more when they are disturbed. 

Their color is light brown, with a thick dark brown stripe on their back and a white underbody. They are small-sized rodents with very long tails and feet. They measure from 18 to 24 cm (including the bottom) and weigh 11.5 to 35 g. 

The meadow jumping mouse is an omnivore, mainly eating seeds, insects, and fruits. 

The meadow jumping mouse lives mostly in grasslands, thin forests, and humid areas in the northern part of North America. 

Their lifespan is less than a year in the wild but up to five years in captivity.

Meadow Vole

The meadow vole is a small, primarily nocturnal rodent—other names, such as the field mouse or meadow mouse, are also known. 

Their colors vary from yellowish or reddish-brown to dark brown, and the underbody is gray. They measure about 12 cm and weigh about 43g. 

This herbivore eats grasses, weeds, grains, seeds, bark, roots, and fruits. They live in dense grasslands and thin forests in the northern part of North America (except for the most intense polar regions). 

The meadow vole is an excellent swimmer and is also good at digging holes. 

Their lifespan ranges from 2 to 16 months. Some people consider them a pest because they cause significant damage to plants and carry similar diseases to other rodents.


The mink is a semiaquatic mammal from Canada and the United States. Their color varies from tan to dark brown or black. 

Mink measure about 62 cm and weigh about 1 kg. 

Mink carnivores eat frogs, fish, salamanders, birds, muskrats, eggs, crayfish, mice, and voles. 

They live near water bodies and close to trees. Their lifespan is three years in the wild and ten years in captivity.

Minke Whale 

The minke whale grows between 21-30 ft (6.5-9m) and weighs between 5.5-10 tons. 

Their diet consists mainly of krill, crustaceans, and small fish in schools. They have a single calf after a gestation period of 10-11 months. 

They are the smallest and most abundant of the rorqual whales. They are slim, with a pointed head, and rarely show much of themselves through the water. 

There are three subspecies of the minke whale; North Atlantic, North Pacific, and dwarf minke whale.


The moose is a solitary animal with huge antlers. Moose are the most prominent members of the deer family. 

Their color ranges from light to dark brown. The moose is massive, measuring from 1.4 to 2.1 m in height and 2.4 to 3.2 m in length. They weigh from 200 to 700 kg.

Moose are herbivores and eat bark, leaves, pine cones, young branches, and fruits. Moose live in forests in the northern part of the entire world and have a lifespan from fifteen to twenty-five years.

Mountain Goat

The mountain goat is the only rock goat (rupicarpine) species in North America. Mountain goats live in the Cascade Mountains, Rocky Mountains, Alaska, Washington, Idaho, and the Yukon and Northwest Territories.

Mountain goats prefer rocky cliffs, slopes, and meadows as their habitats. Mountain goats prefer the safety of the cliffs to keep them away from predators. They spend about seventy-five percent of their lives on rocky cliffs.  

Mountain goat

Mountain goats feed on the cliff faces, grazing on the vegetation. Mountain goats are excellent climbers and spend time on cliff faces up to 60 degrees steep.

Due to their northern habitats, mountain goats migrate during the winter southwards.

Mountain goats grow to 1500 cm in length and weigh up to 136 kg. Males grow larger than females.


The muskox is a hoofed mammal found in Greenland, the Canadian Arctic, and parts of Alaska and Canada. 

The muskox is characterized by a thick coat and a strong odor emitted during the seasonal rut by males. Both males and females have long and curved horns. 

Muskox measure between 1.1 to 1.5 meters high and have an average body length spanning from 150 to 250 cm, with females being smaller than males. Their average weight is 285 kilograms. 

During the summer, these animals live in wet areas such as river valleys and move to higher elevations in the winter period to avoid deep snow. 

Muskox primarily feeds on grasses, lichens, mosses, and Arctic willows. Their primary predator is the wolf. Muskox lives in herds of about 10 to 20 individuals.


The muskrat is the only species of the genus Ondatra. The muskrat is a midsize, primarily nocturnal, semiaquatic rodent from North America. Their colors vary from brown to black, with a lighter underbody. 

Muskrats measure from 40 to 70 cm and weigh 600 grams up to 2 kg. Their lifespan is 3 to 4 years.

The muskrat is an omnivore and eats aquatic vegetation, farm and garden plants, roots, pondweed, fruits, vegetables, snails, salamanders, crustaceans, fish, and birds. 

They live in wetlands in the northern part of North America. They are considered a pest because of the destruction it causes in the places where they live and the diseases they can carry.

The fur of the muskrat is thick and short of a dark-brown color. Their tails are covered with scales that help them swim rapidly and efficiently. 

Muskrats spend the majority of their time in the water and can swim underwater for up to 17 minutes. This species usually lives in a group of males, females, and their offspring. 

Muskrats make nests to protect themselves from cold temperatures and predators. The nests are usually burrows with an underwater entrance.


Narwhals are easy to spot due to their tusks, with males generally being the only ones to grow this. Occasionally they will produce two, and sometimes a female will have a tusk. 

Narwhal measure between 12.1-14.6 ft (3.7-5m) and weigh 1,500-4,000 lb. The male tusk can grow up to 9.8 ft (3m). Males grow larger than females. 

They have light and dark mottling, with a small head and short beak. Narwhals change in color as they grow older, with ancient animals appearing entirely white. 

Young narwhals are blotchy gray or brown, turning gray, then black, then a mottled light and dark color before eventually turning white. 


North American River Otter

The river otter is an intelligent, semiaquatic mammal in the northern states.

The river otter has short, very dense fur. Their colors vary from gray to brown, with a lighter underbody. 

They measure from 66 to 107 cm and weigh 5 to 14 kg. 

River otters are carnivores eating fish, turtles, frogs, crayfish, and insects. 

They live in aquatic habitats in the northern part of North America. Their lifespan is eight to nine years in the wild and fifteen to twenty years in captivity.

North Pacific Right Whale

The North Pacific right whale measures between 49-65 ft (15-17m) with a weight of 34-90 tons. 

Females grow larger than males, and both genders are almost identical in appearance to the North Atlantic right whale, although they can develop a little larger. 

North Atlantic Right Whale

They are one of the most critically endangered whale species, with an estimated population of 400-500 today. 

Northern Bog Lemming 

The Northern bog lemming is a small-sized lemming found in the meadows of Canada, Alaska, northern Washington, and New England. 

They grow up to 13 cm long and weigh around 30 grams. They have short tails and small eyes, with rust-colored hairs at the base of their ears. 

Generally, their bodies are covered with grey or brown fur. These rodents are active during the entire year and are both diurnal and nocturnal. 

They usually come up to the surface to look for food. They typically live in small colonies with other lemmings.

Northern Collared Lemming 

The northern collared lemming can be found in Canada and northern regions of the United States, including Alaska.

They are gray with a black stripe along their back. They have short tails and small ears. Like the ermine and the arctic fox, their fur turns white in winter to help camouflage them from predators.

They grow up to 16 cm long and weigh up to 40g.  

They feed on vegetation and plant material, including sedges, grasses, and twigs.  

They are also known as the Bering lemming or Nearctic collared lemming.

Northern Flying Squirrel 

The Northern flying squirrel is one of three flying squirrels in North America. 

Their habitat is coniferous and mixed coniferous forests. They live in Canada and the United States, from Alaska to Nova Scotia, North Carolina, Utah, and Oregon. 

They are clumsy on the ground but efficient climbers and gliders. They have a furry membrane between their front and hind legs, which they use to glide from tree to tree. Flying squirrels are nocturnal with excellent vision. 

Their length reaches between 25 to 37 centimeters, and they usually weigh between 110 and 230 grams. 

Their color varies from gray to dark brown, with white on their underbody, a flat tail, and big eyes. They also have large whiskers to sense their way around at night.

This omnivore eats nuts, acorns, fruits, buds, fungi, insects, bird eggs, and lichens. The Northern flying squirrel lives in forests in the northern part of the continent with a lifespan of four years.

Northern Fur Seal

The Northern fur seal is a member of the Otariidae family. They are the most prominent member of the subfamily Arctocephalinae and the only living member of Callordhinus.

Male Northern fur seals have black or thick gray fur, with a mane of yellowish or silver-gray long guard hairs from the shoulders up to the neck. 

They have an underfur that is more creamy colored. Females are silver-gray or charcoal on top, with their sides, underside, and chest tan or cream.

Portrait of a cute fur seal swimming in the waterPortrait of a cute fur seal swimming in the water

Males are much larger than females, weighing up to 270 kg. Males can measure up to 2.1 meters. Females are smaller, weighing up to 50 kg, with a length of 1.5 meters.  

Northern fur seals are excellent swimmers, using their forelimbs to propel themselves forward. They use different stroke patterns for different dive patterns.

Northern fur seals can be found along the United States and Canada’s west coast, from California to Alaska.  

Northern Red-Backed Vole 

The Northern red-backed vole can be found in the northwest regions of the United States and Canada.  

They live in scrubland and forest and feed on a diet of central plants. These include forbs, fungi, lichens, leaves, buds, and twigs. They are also known to eat insects occasionally, although these do not make up a large part of their diet.

The Northern red-back vole measures up to 17.5cm long, including its tail, weighing up to 40g. They are a light rusty brown color with short seats.

They built their nests under rocks, roots, fallen trees, or caves.

Northern Right-Whale Dolphin 

The Northern right whale is a large dolphin, measuring 10.2ft (3.1m) and only weighing 250 lb. 

They are distinctive in appearance as being the only dolphin in the North Pacific without a dorsal fin. They are black with a lighter white underside. 

They travel with other dolphins, including Risso’s and Pacific white-sided dolphins. 

They are often seen in British Columbia, California, and Monterey Bay. 

Although most schools are spotted with 100-200 animals, superpods of 3,000 have been seen.

Norway Rat

The Norway rat is also known as the brown rat. They are a rodent that lives all over the world. Their color is brown with a lighter color on the underbody. 

The brown rat measures 15 to 28 cm and weighs 140 to 500 g. 

The brown rat is an omnivore, eating seeds, nuts, grains, fruits, eggs, birds, mice, small rabbits, fish, and insects. 

They live in forests and urban and suburban areas and have a lifespan of two years.

Norway rat

Pacific White-Sided Dolphin

The Pacific white-sided dolphin grows from 7.5-8.2ft (2.3-2.5m) with weights between 360-440 lbs. 

They can be found around the San Juan Islands, Puget Sound, Alaska, Olympic Coast, California, Vancouver Island, and Baja, California. 

They have a pattern of gray and black along the flank with dark flippers and flukes. They have a lighter underside with a white lower jaw. They give birth to a single calf after 12 months.

Polar Bear

Polar bears are classed as marine mammals. They range throughout the arctic regions, with the limits of their range limited by the ice pack of the ocean.  

Polar bears will travel as far as 1,000 km as the ice melts and freezes.  

Polar bears are massive. They can weigh up to 800 kg, reaching a length of 2.5 meters in size. Females are smaller, weighing up to 300 kg and running a height of 2 meters.  

Polar bears have a white appearance to their pelage, but this can change to brown, gray, or yellowish depending on the season. A polar bear’s skin is black, and its fur is translucent. The white appearance is from light being shone through the hair strands.  

Polar bears are excellent swimmers, with large paws to help them swim.  

Polar bears are carnivores, feeding mainly on ringed seals and bearded seals. They will also feed on walruses, hooded seals, sea birds, fish, and other small mammals.  

They mainly consume the fat from seals, leaving behind the meat. The fat has high calories, which is necessary for the polar bear to maintain a fat layer that insulates them in cold temperatures.


The North American porcupine is the second-largest rodent found in North America. Their back is covered with solid quills made of keratin. 

They can be easily recognized by solid quills at the tip and base and are present around the body, except for the stomach. The quills are used as a defense mechanism.

North American porcupines have a dark brown or black color with hairless feet. They measure from 60 to 90 cm without counting the tail, which measures around 14.5 to 30 cm. They weigh from 4.5 to 18 kg.

They are herbivorous, eating leaves, seeds, grass, nuts, buds, fruits, and green plants. They are often found climbing on trees to eat leaves. 


The porcupine lives mostly in forests, deserts, and grasslands in the northern part of North America, with a lifespan of about 30 years. 

This species of the porcupine are endangered because due to hunting and also because of loss of habitat.

Pribilof Island Shrew

The Pribilof Island Shrew is an endangered species of shrew. They face extinction from livestock farming and ranching.  

They can be found on Saint Paul Island in the Pribilof Islands, where they can be found along coastal regions.   

Pygmy Shrew

The American pygmy shrew is a small mammal from the continent’s North. Their color ranges from reddish-brown to grayish-brown, and the pygmy shrew has a light color on their underbody.  

This species of shrew measures up to 5 cm and weighs from 2 to 4.5 g. 

The American pygmy shrew is an insectivore and will eat insects and larvae. They live in coniferous and deciduous forests, with a lifespan of about 16 to 17 months.


The raccoon is a nocturnal midsize mammal. Their color is gray, brown, or black. They have a white faces with black masks around their eyes. 

They measure from 40 to 70 cm and weigh 5 to 26 kg. 

The raccoon is an opportunistic omnivore eating fruit, plants, oak nuts, insects, worms, rodents, frogs, nuts, eggs, and crayfish. 

Raccoons live in forests and suburban and urban areas in North America’s Central and southern states. The average lifespan of a raccoon is two to three years.

Red Fox

The red fox is a midsize fox that lives in the northern region of North America. 

The color varies from light yellow to red, with dark legs and a white underbody. They measure from 45 to 90 cm and weigh from 2.2 to 14 kg. Their lifespan is between two to five years. 

The red fox is an omnivore eating grasses, fruits, corn, apples, oak nuts, cherries, berries, mice, birds, rabbits, squirrels, crickets, grasshoppers, beetles, caterpillars, and crayfish. 

The red fox lives in forests, grasslands, mountains, deserts, and suburban areas.

Red Squirrel

The red squirrel is a small, solitary, and diurnal animal. Their color is gray, red, or dark brown, with white on their underbody, and they sometimes have black stripes on their sides. 

They measure from 28 to 35 cm (including the tail) and weigh from 200 to 282 g. 

The red squirrel eats sunflower seeds and all types of nuts. They are arboreal, living in coniferous, deciduous, and mixed forests, with 5 to 10 years of life.

Ribbon Seal

The ribbon seal is an earless seal from the family Phocidae. The ribbon seal is the only species of Histriphoca.

Ribbon seals are named for their fur, with four white markings (ribbons) on black skin.   These are circular markings on both sides, a stripe around the tail, and a strip around the neck.  

Females have a much less conspicuous difference in color than males between the ribbons.  

Pups are born with white fur, but over the three years after birth, they begin to develop darker portions of their skin, becoming dark rings.  

The ribbon seal has an air sac that is inflatable and is used for vocalizing underwater.  

Male and female ribbon seals grown to the same lengths and weights, weighing up to 95 kg ad growing 1.6 meters long.

Ribbon seals live around Alaska but have been found in Long Beach, Seattle,  Washington, and as far South as Morro Bay in California.

Ringed Seal

The ringed seal is also known as the jar seal, nets, or attic and is a species of earless seal usually inhabiting the Arctic and sub-Artic regions. 

They are relatively small-sized seals and rarely measure more than 1.5 meters in length. The average dimensions span between 100 to 175 cm in body length, and their body mass is usually between 32 to 140 kilograms. 

These seals are characterized by a distinct pattern of dark spots surrounded by light gray rings that give rise to their common name. 

They can be found throughout the North Hemisphere throughout the Arctic Ocean into the Bering Sea, Bristol Bay in Alaska, Okhotsk Sea in Russia, and the North Atlantic coasts of Greenland and Scandinavia. 

They prefer to rest on the ice floe and move farther north for denser ice. They remain in contact with ice most of the year and pup on it in late winter and early spring. 

Ringed seals feed on a wide variety of fish and invertebrates. Fishing is a solitary behavior. 

They are an essential food source for polar bears and have been a critical component of the diet of Arctic indigenous people for many years.

Risso’s Dolphin

Risso’s dolphin looks utterly different from any other species of dolphin. When playing or fighting, they are heavily scarred by squid or each other. 

They have a bulbous, large head with a beak that is not distinct. They have a crease on the front of the melon, with a dark dorsal fin, flipper, and flukes. 

Risso’s dolphins are of various colors, ranging from light white to dark gray. 

They are large dolphins growing from 12.5-13.5 ft (3.8-4.1m) and weighing 660-1,100 lb.

Sea Otter

The sea otter is a marine mammal that can be found on the coasts of the northern and eastern North Pacific oceans. They usually weigh between 14 and 45 kilograms and are about 1.2 to 1.5 meters in total body length. 

They are considered the most prominent members of the weasel family but are one of the smallest marine mammals. 

Their primary form of insulation is a thick coat of fur, and they can live exclusively in the ocean. 

They feed primarily on marine invertebrates such as urchins, mollusks, crustaceans, and fish species. 

In the past, sea otters were hunted extensively for their fur, significantly decreasing their population. However, conservation efforts and reintroduction programs have managed to successfully re-establish sea otters’ presence in their natural habitat. They are still listed as endangered species. 

Their pelage is usually brown. They are diurnal animals that tend to rest together in single-sex groups called rafts. A raft might contain from 10 to 100 individuals. Male rafts are usually bigger than female ones. 

They can be found in protected areas from the most severe ocean winds, such as rocky coastlines and barrier reefs.

Sei Whale 

The sei whale is a large marine mammal, measuring 39-52 ft (12-18m) and weighing between 17-45 tons. The females are more significant than the males. 

There are no commercial whale-watching operations anywhere dedicated to watching this species of whale. They do not gather in the same areas from one season to the next as most whales do, making them elusive. 

They have a more varied diet than most other baleen whales. Their diet includes krill, copepods, crustaceans, and schooling fish. They are primarily dark gray or brown, with a prominent dorsal fin.

Short-finned Pilot Whale 

The short-finned pilot whale is medium-sized, growing from 12-23 ft (3.6-7.2m) and weighing between 1.1-3.9 tons. 

They are dark gray, brown, or black with a gray patch behind the fin. Short-finned pilot whales are stocky, with a round forehead and almost non-existent beak. 

They have a large dorsal fin set forward on the body but arches backward. 

They typically travel in groups of 15-50 individuals, but groups of several hundred have been seen together.  

Short-tailed Weasel

The short-tailed weasel is also known as the ermine. Ermine are solitary weasels that live in the northern part of the continent. 

Their color is dark brown on the back and white on the underbody during the summer. In winter, their color changes to almost pure white. 

The ermine measures from 17 to 32 cm and weigh about 260 g. The ermine is a carnivore that eats mainly rodents but will also eat birds, fish, amphibians, small reptiles, and insects. 

They live in taigas and tundras, with a lifespan of four to six years in the wild.

Silver-haired Bat 

The silver-haired bat is a nocturnal, solitary mammal from the central part of North America. They use echolocation when flying to guide them and to find food.

Their color is typically black but sometimes dark brown, with gray tips to their fur.  

They measure about 10 cm and weigh from 8 to 12 g. This insectivore eats flies, leafhoppers, moths, mosquitoes, beetles, bugs, and ants, which they find in forest habitats.

Their average lifespan is 12 years, and they migrate to warmer climates in winter.

Singing Vole

The singing vole can be found in Alaska and the northwestern regions of Canada.

Their name comes from a vocalization that is used as a warning. The sound is a high-pitched trill. The warning call is usually given by one singing vole from just inside the entrance to its burrow.

They can grow up to 20cm in total length and weigh up to 60g.

They live above the tree line in tundra regions, preferring to live in open slopes and flats with plenty of plant material.

Singing voles feed on vegetation and plants.

Sitka Deer 

Sitka deer are also known as Sitka black-tailed deer. They are a subspecies of mule deer found in Sitka in Alaska and British Columbia in Canada.

They can be found in the Alexander Archipelago, Queen Charlotte Island, Prince William Sound, Skagway, Kodiak Island, and Haines.

Sitka deer are smaller than most subspecies of mule deer, weighing up to 90kg.

Their color darkens in fall to a gray-brown from a reddish-brown in summer.  

Snowshoe Hare 

The snowshoe hare is also called the varying hare or snowshoe rabbit, taking this name because of the large size of the hind feet.   

They are a hare from the northern region of North America. 

The snowshoe hare lives in the boreal and Montane forests of North America.

They have wide paws for moving in the snow. Their feet prevent these rabbits from sinking in the snow when hopping and walking. They are also covered with fur on the soles to protect against freezing temperatures. 

Snowshoe hare

Their color is brown in summer and white in winter, but they always have a gray underbody. They can be distinguished by black tufts of hair on the edge of their ears and by the relatively small size of their ears compared with other hares. 

Their lifespan is five years. They usually measure about 36 to 52 centimeters and can weigh 1.3 to 1.7 kilograms as adults. 

The snowshoe hare is a herbivore and eats grass, leaves, ferns, buds, twigs, evergreen needles, trim stems, and bark. They adapt their diet according to the season. They usually feed on grass, fens, and leaves during the summer and turn to twigs and bark in the wintertime.

Southern Red-Backed Vole 

The Southern red-backed vole is a primarily nocturnal, small mammal from the central part of North America. Their color is gray, with a red stripe on their back and an underbody of gray or white. 

The Southern red-backed vole measures 7 to 11.2 cm and weighs 6 to 42 g. They have a lifespan of 10 to 20 months. 

This vole species is an omnivore-eating insect with grains, fruits, nuts, seeds, berries, leaves, roots, bark, fungi, and lichens. 

They live in coniferous, deciduous, and mixed forests near water bodies in southern Canada and the northern United States.

Sperm Whale 

Sperm whales grow 36-52 ft (11-16m) with a weight between 15-50 tons. 

They have a dark gray body with a squarish head and a hump instead of a dorsal fin. 

Their blowhole is slit-like, and they can often be seen laying motionless at the water’s surface. They have a single calf after a long gestation period of 14-16 months.  

Spotted Seal

The spotted seal can be found around the Pacific Ocean in Alaska during summer when the water is relatively ice-free.  

Spotted seals are similar in size to harbor seals, often sharing the same areas, leading to misidentification. They measure 1.5 to 2.1 meters and weigh between 81 to 109 kg. They can live to the age of 35 years.

Spotted seals can dive up to 1,000 ft to find prey. They eat crustaceans, krill, herring, cod, capelThey, and pollock.  

There are approximately 200,000 seals around Alaska, leading to U.S. National Oceanic and Atmospheric Administration (NOAA) to state that they were not in danger of becoming extinct or likely to become in the foreseeable future. There are thought to be 335,000 – 450,000 spotted seals Worldwide.

portrait of cute spotted seal

Spotted seals get their name from their coat patterns, lightly colored with dark spots. They have roundheads, petite bodies, and narrow snouts.  

St. Lawrence Island Shrew 

The St. Lawrence Island shrew is an endangered species of shrew that can be found only on St.Lawrence Island.

St. Matthew Island Vole

The insular vole is a rodent species that is only located on St Matthew Island and Hall Island in Alaska. 

Their average size spans between 90-115 mm, and they usually weigh 25 grams.

These animals are primarily diurnal and follow a vegetarian diet. 

Natural predators are birds and Arctic foxes. Arctic foxes are the only mammals found on St. Matthew and Hall Islan islands.

Stejneger’s Beaked Whale 

Stejneger’s beaked whale is a medium-sized whale. They grow between 15.7-18.7 ft (4.8-5.7m), with females slightly larger than males. Their weight is between 1.1-1.8 tons. 

They can be seen in groups of 5-15 and eat mainly squid. Not much is known about them, with a single skull being the only evidence for a long time. 

Some are almost black, but most are brownish-gray with scarring on the body. They have a dark mask from the eyes to the blowhole, with the rest of the face being lighter. They have a small dorsal fin one-third from the back.

Steller Sea Lion

The Steller sea lion is also known as the northern sea lion. They are a species of sea lion typically found in the north Pacific. 

They are considered the largest species of eared seals and take their names from the naturalist George Wilhelm Steller, who first described them in the mid-18th century. 

These animals measure about 2.3 to 2.9 meters in length on average and weigh between 240 to 350 kilograms. 

Males are slightly longer than females and can be distinguished by broader foreheads and thicker hair around their necks. 

The range of these seals extends from Russia to the Gulf of Alaska and the Ano Nuevo Island off the coast of Central California. 

Steller sea lions usually live in the coastal waters of the subarctic and spend most of their time in the water. They are skilled and opportunistic marine predators. 

They primarily feed on a wide variety of fish and are hunted by killer whales and great white sharks.

Striped Dolphin

The striped dolphin takes their name from the dark stripes running down their bodies’ sides. 

They have a gray or blue-gray cape on the dorsal side, with stripes from the eye to the flipper along their sides. They can also have bars with pink and blue colors on their sides. 

They grow from 5.9-8.9 ft (1.8-2.7m) and weigh 200-360 lb. 

They have some unusual behaviors, able to leap up to 23 ft, with belly flops and somersaults seeming no trouble. 

They also roto-tail when they come out of the water. This involves moving their tails in circles as they leap out of the water.  

Tiny Shrew

The tiny shrew is also known as the Etruscan shrew. This species of the shrew is known as the smallest mammal with a mass of less than 2g.

The Etruscan shrew grows to a length of just 4cm. As with many other species of the shrew, the tiny shrew has to eat a lot of food to keep up with its metabolism. This species of shrew can eat up to 2 times its body weight in one day.

They feed mainly on insects the same size or smaller than themselves.

Tundra Vole

The tundra vole is a medium-sized rodent found in Northern and Central Europe, North America, and Asia. 

They are about 18 cm long and weigh about 50 grams. This species is found in tundras or meadows and generally lives near water sources. 

The tundra vole is not commonly seen as it primarily lives underground. They like to store seeds and roots in the burrows they dig. 

The population of the tundra vole can vary significantly from year to year in a given area. Their fur is yellowish-brown.


The walrus is a large marine mammal weighing more than 2,000 kg, although most weigh up to 1,700 kg. Males are more significant than females.  

They are similar in body shape to sea lions and seals. They have two long tusks at the front of their teeth, reaching a massive 1 m (3ft 3in).  

As with some other animals, walruses with enormous tusks are the leaders of their groups. They also use their tusks to make holes in the ice on which they live, helping them get out of the water.

Water Shrew 

The water shrew is a semiaquatic mammal found in the western regions of North America. They are also called the Pacific water shrew or the marsh shrew. 

Water shrews are dark brown. They measure about 16 cm and weigh from 14.5 to 16 g. 

The water shrew is an insectivore eating spiders, bugs, worms, centipedes, and termites. They live in forests and near water bodies such as marshes, with a lifespan of about 18 months.

Western Heather Vole 

The western heather vole can be found throughout Alaska. They can be found in coniferous forests, wet meadows, willow thickets, and forest edges.

The heather vole is a herbivore feeding on berries, seeds, fungus, lichen, and shrubs. They collect their food for later use, storing it in their burrows. Food is ordered at night for use during the day.  

The nest of the western heather vole has a hidden entrance with several tunnels leading off. Nests are usually hidden under a log stump or rock.

Males and females are approximately the exact sizes, with a weight of up to 40g and a length of 15 cm.

Western Jumping Mouse 

The Western jumping mouse has measurements ranging between 22 to 25 centimeters in length and weighs between 17-40 grams. 

These mice might resemble ordinary mice because of their dark fur. However, they are smaller and have longer legs. 

In terms of diet, they are omnivorous, spending most of their time during the summer building up fat reserves to be used during the winter when they hibernate.  

They like to live under dense grasslands or thick brushes, where they are more challenging to find by predators.


The wolverine resembles a small bear but is the most prominent member of the Mustelidae family.

They are ferocious and have tremendous strength for their body size. They are the size of a medium dog but can take down prey many times their size, such as elk. 


They live in cold climates, with thick, oily fur, and are resistant to frost. They are dark in color, with a light mask on their face and bushy tails.   

They have been called the skunk bear due to the scent glands that they use to mark their territory.


The woodchuck is also known as the groundhog or the red monk. They are typical of the eastern United States, Canada, and Alaska regions. 

Males are usually bigger than females, but their weight changes considerably across seasons. Generally, they measure 42 to 68.5 cm, although their weight ranges from 2 to 6.5 kilos during the year. 

They are a diurnal animal that, on average, lives two to three years. They enjoy staying in the open air and are territorial animals living in colonies.

Yellow-Cheeked Vole

The taiga vole gets its name from living in the boreal taiga zone. They can be found in Alaska and northwestern Canada.

They are sometimes called the yellow-cheeked vole or the chestnut-cheeked vole due to the color of their face.

They measure up to 23cm in length and weigh 170g.

Taiga voles can’t go without food for more than 24 hours or may die due to a simple metabolism.