A sea otter floating upright in blue-green water, its dark front paws held together in front of its chest and its pale, whiskered face turned toward the camera

October 15, 2026 Aaron Seminoff

Cute Sea Otters: Facts and Photos of an Adorable Otter

A sea otter is the smallest marine mammal and a member of the weasel family, and it lives in the nearshore waters of the North Pacific, according to the US Fish and Wildlife Service (USFWS). The National Park Service’s Kenai Fjords page, which covers the northern sea otters of Alaska, says they average four to five feet long and weigh 80 pounds, and that a dense coat of fur takes the place of blubber.

Cute Sea Otter Fur, Size, And Whiskers

The National Park Service says a sea otter’s coat has dark brown underfur and a few lighter brown or silver guard hairs, with between 600,000 and 1,000,000 hairs in each square inch. With age the fur on the head turns gray-white, and that is where the nickname “old man of the sea” comes from.

The USFWS gives averages for southern sea otters, the subspecies along the central California coast: about 46 pounds for adult females and 64 pounds for adult males. The National Park Service says some sea otters reach six feet and 100 pounds.

The San Diego Zoo Wildlife Alliance says otters have two layers of fur: a thick undercoat that holds air and a topcoat of long, waterproof guard hairs. The air in a sea otter’s coat also helps it float. Whiskers above the lips sense water movement and nearby prey or predators, and they help an otter find food in cloudy water. The zoo adds that otters spend a lot of time grooming because good fur matters so much.

What Sea Otters Do All Day

Half of a sea otter’s day goes to diving for food and eating it, the San Diego Zoo Wildlife Alliance says. Its main foods include sea urchins, abalone, crabs, mussels, and clams, and the zoo also lists fish and octopuses. The USFWS says an average adult needs food equal to 20 to 30 percent of its body mass every day.

Sea otters use tools, the USFWS says, usually a rock that works as a hammer or an anvil on hard-shelled prey. The agency adds that a loose skin pocket under the armpit holds several items from one dive. The San Diego Zoo Wildlife Alliance says sea otters crack clams and mussels open with a rock held on the stomach, and that no other otter uses rocks as tools.

Resting sea otters usually stay in groups, the USFWS says. To avoid drifting, they often wrap themselves in kelp or seagrass, which makes something like a raft.

Sea Otter Pups

Baby otters are called pups, the San Diego Zoo Wildlife Alliance says. A sea otter pup is born with open eyes and a coat that lets it float even though it cannot swim yet. The mother carries it on her belly for about two months, until it begins to swim and dive without her help.

The National Park Service says a newborn sea otter pup measures about 10 inches and weighs about five pounds. At first a pup cannot swim, feed itself, or keep its fur clean, so it needs constant attention. The park’s Kenai Fjords page says a good way to spot a pup is to look for a female floating on her back with the pup resting on top of her.

How Much Is A Baby Otter?

Sea otters are covered by federal law. The USFWS says the Marine Mammal Protection Act “establishes a moratorium on taking and importing marine mammals, including parts and products.” The USFWS also says the southern sea otter has protection under the Endangered Species Act, the Marine Mammal Protection Act, and California law.

Other otter species have international rules. At the 2019 meeting of the parties to CITES (the Convention on International Trade in Endangered Species of Wild Fauna and Flora) in Geneva, the proposal to move the small-clawed otter from Appendix II to Appendix I was adopted, and the USFWS outcomes list says the change took effect on 26 November 2019. In its position on that proposal, the USFWS said the small-clawed otter’s habitat has decreased and “high levels of poaching have been demonstrated and documented.”

Cute Otters Swimming

An otter in murky green water with its head tipped up, whiskers showing, and one front paw raised near its shoulder

Otters are the only serious swimmers in the weasel family, the San Diego Zoo Wildlife Alliance says. Nearly all have webbed feet, with more webbing on some species than others, and they can shut their ears and nostrils underwater. Depending on the species, an otter can stay under for five to eight minutes.

The National Wildlife Federation says a North American river otter has short legs, webbed feet, a long narrow body, and a flat head, and can stay underwater as long as eight minutes. Sea otters float more easily than river otters, which must keep swimming to stay up, according to the zoo.

Otters also make a lot of noise. The zoo lists whistles, growls, screams, barks, chirps, moans, and coos as otter sounds. It says river otters seem to like sliding down mud banks or in the snow, and that this kind of play is part of courtship, social bonding, and communication.

There Are 13 Species Of Otter

The Smithsonian’s National Zoo says the Asian small-clawed otter is the smallest of the 13 otter species and comes from Asia. It weighs less than 10 pounds and grows up to two feet long. Its fur is dark brown on top and lighter underneath, often with some gray, white, or cream coloring on the face and throat.

The National Wildlife Federation says a North American river otter measures three to four feet including the tail and weighs 11 to 30 pounds. It lives across much of Canada and the United States, in ponds, marshes, lakes, rivers, and estuaries.

Otters In Groups

A group of small otters with dark brown fur and pale faces and throats, crowded together on sunlit rocks

For most otters, the San Diego Zoo Wildlife Alliance says, a social group is a mother with her older young and her newest pups, and the males spend most of their time by themselves or with a few other males. Bigger groups can form during breeding or where food is plentiful, especially sea otters in kelp beds.

In the National Wildlife Federation’s description, river otters usually live by themselves or in small social groups. The Smithsonian’s National Zoo calls Asian small-clawed otters social and says everyone in a family group helps feed and care for the young.

Otters also show up in Mi’kmaq legend, where the Native Languages of the Americas site describes Keoonik.

Why Sea Otters Matter To Kelp Forests

The USFWS says that as a keystone species, sea otters “play a fundamental role in the natural food web, and keep important elements of coastal ecosystems like kelp forests and seagrass beds in balance.” Read more about keystone species.

Sea Otters And Sea Urchins

The USFWS says sea otters help maintain kelp by eating sea urchins, and that urchins left unchecked can clear-cut kelp forests. The National Park Service says sea otters pick older, larger urchins, and that big urchin populations left alone can create an “urchin barren.”

The USFWS also says sea otters help seagrass. Crabs eat sea slugs and isopods, and sea otters eat crabs. With the crabs held down, the sea slugs and isopods graze the algae that coat seagrass blades, so sunlight can reach the seagrass.

Kelp, Seagrass, And Carbon

The USFWS says kelp and seagrass take carbon dioxide from the air and turn it into organic carbon as they grow. Part of that carbon stays stored in the plants, and part is sequestered in the deep ocean or in sediment. The agency says sea otters help limit climate change and some of its effects through this kelp and seagrass work. Read more about climate change.

The USFWS adds that these effects on kelp and seagrass indirectly help commercial, recreational, and subsistence fisheries for fish such as salmonids, Pacific herring, rockfish, kelp greenling, and lingcod.

Saving Sea Otters

The National Park Service says an estimated 100,000 to 150,000 sea otters lived around Alaska when Russians arrived in 1741. Hunting killed nearly half a million by 1900, and the world population fell to an estimated 1,000 to 2,000. A treaty protected sea otters in 1911. The park service says about 168,000 now live off Alaska and Russia.

A few dozen southern sea otters avoided hunters off Big Sur, and the USFWS says that is how the subspecies survived the fur trade. The population has grown slowly since federal protection began in the 1970s and has hovered around 3,000 in recent years. In the late 1980s the agency moved 140 sea otters from the central California coast to San Nicolas Island. Most returned to their home range or went elsewhere in California, some died, and about a dozen stayed and slowly formed a small core population.

Oil is a danger to sea otters. The USFWS says oil on the fur can ruin the coat’s insulation and cause hypothermia and death. The National Park Service says the 1989 Exxon Valdez oil spill killed at least 1,000 sea otters.

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FAQ

How close can I get to a sea otter?

To avoid disturbing sea otters, the USFWS asks people to back away if an otter notices them, because that means they are too close. For kayaks, it says to stay at least 60 feet, or five kayak lengths, away. Pets should be leashed near docks and harbors and never allowed to interact with sea otters, even if the animals look like they are playing. The USFWS also says never to feed sea otters, because they can become aggressive, and that can lead to their removal from the population.

Where can I see sea otters?

The National Park Service says sea otters turn up in the Seward small boat harbor, in Resurrection Bay, and in the fjords of Kenai Fjords National Park in Alaska, and that it often sees rafts of three to five otters between the harbor and a spot just north of Caines Head. The USFWS says southern sea otters live along the central California coast, including near harbors.

Is a river otter the same as a sea otter?

No. The San Diego Zoo Wildlife Alliance says the sea otter rarely comes ashore, unlike other otters. The National Wildlife Federation lists ponds, marshes, lakes, rivers, and estuaries as places the North American river otter lives.

Sources

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