Mammals comparison

Sea Lion vs Walrus: Key Differences Explained

The short answer

These are two of the three living pinniped families. The sea lion is an otariid, an eared seal with small external ear flaps, long fore flippers and a dense coat, hunting fish and squid in open water. The walrus is the only living member of Odobenidae: it has no ear flaps, carries tusks in both sexes, wears sparse bristly hair over thick wrinkled hide, and feeds on the seabed, using stiff whiskers to find clams in the sediment.

The main difference

A sea lion is an eared seal with visible ear flaps that chases fish through open water; the walrus is the sole living odobenid, tusked in both sexes and feeding on shellfish taken from the seabed.

Placing an otariid beside the only living odobenid shows how differently two pinniped families solved the problem of feeding at sea, and clarifies why the walrus is not simply a very large sea lion.

At a glance

Comparison of Sea Lion and Walrus across 7 dimensions, with an interpretation of each difference.
What differs	Sea Lion	Walrus	What it means
Family	Otariidae, the eared seals, shared with the fur seals	Odobenidae, a family with a single living species, Odobenus rosmarus	Together with Phocidae, the true seals, these make up the three living pinniped families.
Tusks	No tusks; the canines are ordinary carnivore teeth	Upper canines grow into tusks in both sexes and continue lengthening with age	Tusks serve for hauling out onto ice and for social display rather than for digging up food.Tusk length varies with sex, age and wear, and older animals frequently have broken tips.
External ears	Small external ear flaps sitting behind the eye	No external flap, only an ear opening on each side	The walrus shares this with true seals, which is one reason its family placement surprises people.
Whiskers	Sensitive vibrissae used to track the wake left by a swimming fish	Several hundred short, stiff, densely packed vibrissae forming a mobile pad that finds buried bivalves by touch	The whisker pad is the walrus's primary foraging organ, effectively a hand made of bristles.
Feeding mode	Pursuit predator on schooling fish and squid, usually in mid-water	Benthic forager that suctions the soft parts out of clams and other invertebrates on the bottom	The two exploit entirely different layers of the same ocean.
Skin and coat	Dense coarse fur over the body, with a longer mane in adult males of several species	Sparse bristly hair over thick, deeply wrinkled hide with heavy blubber beneath	The walrus relies on hide and fat rather than a fur coat for protection and warmth.Walrus skin shifts from pale in cold water to pink as surface blood flow rises once the animal warms.
Size	Species-dependent: California sea lion males roughly 200-400 kg, Steller sea lion males can exceed 1,000 kg	Among the largest pinnipeds, with Pacific walrus males exceeding 1,200 kg	Only the biggest sea lions approach walrus mass, and the two are never confused where both are visible.Published mass ranges shift with season, region and how the animals were measured.

Family: Sea LionOtariidae, the eared seals, shared with the fur seals
WalrusOdobenidae, a family with a single living species, Odobenus rosmarus
Together with Phocidae, the true seals, these make up the three living pinniped families.
Tusks: Sea LionNo tusks; the canines are ordinary carnivore teeth
WalrusUpper canines grow into tusks in both sexes and continue lengthening with age
Tusks serve for hauling out onto ice and for social display rather than for digging up food.Tusk length varies with sex, age and wear, and older animals frequently have broken tips.
External ears: Sea LionSmall external ear flaps sitting behind the eye
WalrusNo external flap, only an ear opening on each side
The walrus shares this with true seals, which is one reason its family placement surprises people.
Whiskers: Sea LionSensitive vibrissae used to track the wake left by a swimming fish
WalrusSeveral hundred short, stiff, densely packed vibrissae forming a mobile pad that finds buried bivalves by touch
The whisker pad is the walrus's primary foraging organ, effectively a hand made of bristles.
Feeding mode: Sea LionPursuit predator on schooling fish and squid, usually in mid-water
WalrusBenthic forager that suctions the soft parts out of clams and other invertebrates on the bottom
The two exploit entirely different layers of the same ocean.
Skin and coat: Sea LionDense coarse fur over the body, with a longer mane in adult males of several species
WalrusSparse bristly hair over thick, deeply wrinkled hide with heavy blubber beneath
The walrus relies on hide and fat rather than a fur coat for protection and warmth.Walrus skin shifts from pale in cold water to pink as surface blood flow rises once the animal warms.
Size: Sea LionSpecies-dependent: California sea lion males roughly 200-400 kg, Steller sea lion males can exceed 1,000 kg
WalrusAmong the largest pinnipeds, with Pacific walrus males exceeding 1,200 kg
Only the biggest sea lions approach walrus mass, and the two are never confused where both are visible.Published mass ranges shift with season, region and how the animals were measured.

How they are related

Pinnipedia contains three living families and this page covers two of them. Otariidae, the eared seals, holds sea lions and fur seals across roughly fifteen species. Odobenidae holds one living species, the walrus, with Atlantic and Pacific subspecies recognised and a Laptev population sometimes treated as a third. Phocidae, the true seals, is the third family. Molecular work groups the walrus with otariids more closely than with phocids, though the placement was long debated.

A note on naming: Sea lion is a common name covering several otariid species, so that side of the comparison describes typical family traits, while walrus refers to the single living species Odobenus rosmarus.

Telling them apart

There is no realistic chance of mixing an adult walrus with a sea lion once tusks are visible, but the supporting traits still matter. The walrus has no external ear flap, a squared muzzle carrying a dense pad of stiff whiskers, sparse hair over wrinkled hide, and enormous bulk. A sea lion has visible ear flaps, a dog-like muzzle with finer whiskers, and a furred, comparatively sleek body. Tuskless juvenile walruses are the only real ambiguity.

Tusks, wrinkled sparsely haired hide, a broad whiskered muzzle, packed together on Arctic ice: walrus. Small ear flaps, sleek fur, long bare fore flippers, barking along a temperate coastline: sea lion. If the animal is on the Arctic shelf it is not a sea lion, and if it is on a Californian jetty it is not a walrus, so geography does most of the work in this pair.

Habitat and distribution

The walrus is an Arctic and subarctic animal, tied to shallow continental shelf where the seabed lies within diving range and to sea ice or coastal haul-outs for resting. Sea lions occupy temperate to subpolar coasts across the Pacific, the southern Atlantic, South America and Australasia, and no sea lion species is an Arctic ice animal. The ranges do not meaningfully overlap, so geography separates them before any anatomical feature is examined.

Diet and ecological role

Feeding is the deepest split. A walrus works the seabed, ploughing sediment with its muzzle, locating bivalves with the whisker pad and drawing the soft parts free with powerful suction generated by a piston-like tongue, and a single foraging bout can process a very large number of clams. Sea lions chase fish and squid through the water column, near the surface or at moderate depth, relying on speed and manoeuvrability rather than touch.

Behaviour

Walruses are intensely gregarious, hauling out in dense heaps on ice or beaches, often in the hundreds or thousands, with bodies pressed into contact. Males produce bell-like underwater sounds and clicks during the breeding season. Sea lions also breed colonially, with territorial males and near-constant barking, but they do not pile into body contact the same way and they move far more freely on land. Both settle male competition largely through display and posture.

Senses and adaptations

The walrus vibrissal pad is one of the most sensitive touch organs known in any mammal, letting the animal locate buried bivalves in dark, turbid sediment where vision is useless. Sea lion whiskers work differently, detecting the hydrodynamic wake a swimming fish leaves behind. Both share the diving package of elevated blood volume, myoglobin-rich muscle and a slowed heart rate on submersion; the walrus dives shallow but long over the shelf while sea lions make faster repeated dives.

More on this topic: Animal senses and adaptations.

Lifespan and life stages

Walruses are long-lived, commonly reaching their thirties and sometimes beyond in the wild, and age is often estimated from growth layers laid down in the teeth. Sea lion lifespans vary by species, with many animals reaching the late teens and twenties and males generally shorter-lived than females because of the cost of holding a breeding territory. Animals in managed collections may exceed wild figures, so those records should not be read as wild expectations.

People and these animals

Both have long histories with coastal peoples. Walruses have been hunted by Arctic communities for ivory, hide and meat for millennia and remain part of regulated subsistence harvests, while commercial hunting in past centuries reduced several populations severely. Sea lions were taken for oil and hides and now interact with fisheries, sometimes contentiously. Both are covered by marine mammal legislation in several countries, including rules on approach and disturbance at haul-outs.

Conservation context

Walrus concern centres on sea-ice loss, which pushes animals into large coastal haul-outs further from feeding grounds, and on disturbance at those sites, alongside regulated subsistence harvest. Sea lion status varies by species: some populations have recovered since hunting ended, while the western Steller, Galapagos and Australian sea lions remain of concern. Because assessments are updated, read the current IUCN Red List entry for the walrus and for the specific sea lion species.

Assessments are revised as new survey data arrives, so check the current IUCN Red List entry for the walrus and for the individual sea lion species rather than assuming a fixed status.

What they have in common

Both are pinnipeds that can rotate their hind flippers forward and move on all fours ashore.
Both haul out in large breeding aggregations and both show marked size differences between the sexes.
Males of both advertise with sound through the breeding season, the sea lion barking almost continuously in air while the walrus delivers bell-like calls underwater.
Both were hunted commercially for oil, hide or ivory and are covered by marine mammal law in several countries.

Key differences

Sea lions have external ear flaps, while the walrus has only an ear opening.
The walrus carries tusks in both sexes, whereas sea lions have ordinary canine teeth.
The walrus forages on the seabed by touch, while sea lions pursue fish and squid in mid-water.
Sea lions have dense fur, whereas the walrus has sparse bristles over thick wrinkled hide.
The walrus is Arctic and shelf-bound, while sea lions occupy temperate and subpolar coasts.

Where people go wrong

Filing the walrus with sea lions simply because both can walk on all fours.
Assuming the walrus digs clams out of the seabed with its tusks.
Treating the walrus skin colour change as a health sign rather than normal circulation.
Expecting to find a sea lion in Arctic pack ice; no sea lion species lives there.

Frequently asked questions

Is a walrus a type of sea lion?

No. The walrus is the only living member of its own family, Odobenidae, while sea lions sit in Otariidae with the fur seals. Molecular studies do place walruses closer to otariids than to true seals, which is why the two share the ability to rotate the hind flippers forward and walk, but they are separate families with a long independent history behind them.

Why does the walrus have tusks when sea lions have ordinary canines?

The tusks are elongated upper canines that keep growing through life, and their documented uses are hauling the body out onto ice — the old name tooth-walking sea-horse refers to exactly that — and social display, with longer tusks signalling status. Sea lions settle equivalent contests through size and posture. Tusks are not the walrus's digging tool; the whiskers and muzzle do that work.

Can a walrus walk on land the way a sea lion does?

Yes, and this is a genuine shared trait rather than a coincidence. Both can rotate the hind flippers forward beneath the body and move on all fours, unlike true seals. A walrus is far heavier and moves ponderously, hauling much of its bulk with the fore flippers, while a sea lion can move quickly and even gallop across rocks and breakwaters.

Why does a walrus change colour from pale to pink?

It is circulation rather than pigment. In cold water the surface blood vessels constrict to conserve heat and the animal looks pale, sometimes almost greyish white. Once hauled out and warming in air or sun, blood flow to the skin increases and the hide flushes pink or reddish brown. Sea lions, insulated by fur as well as blubber, do not show this shift in the same visible way.

How many pinniped families are there, and where do these two sit?

Three living families. Otariidae, the eared seals, contains sea lions and fur seals. Phocidae, the true seals, contains harbour, grey, harp, leopard, Weddell, monk and elephant seals among others. Odobenidae contains only the walrus. This page compares an otariid with the sole odobenid, which is why the differences run to family-level anatomy rather than to species-level detail.

Read the full profiles

Sources and methodology

How this comparison is built: FaunaHub comparisons are assembled from the sourced animal profiles behind them rather than written as standalone claims. Figures such as size, mass, and lifespan are typical ranges that vary by subspecies, population, region, sex, age, and — where relevant — whether an animal lives in the wild or under human care, so they are presented as ranges rather than fixed values. Where a common name covers a group rather than a single species, the page says so instead of implying a species-to-species match. Conservation status changes over time and should be confirmed against the current IUCN Red List. Dimensions that could not be supported from the underlying profiles are omitted rather than filled in.

What this page does not do: it does not rank the two animals, predict the outcome of a confrontation, or present either one as stronger, smarter, or better. It is not veterinary, medical, first-aid, handling, capture, hunting, or pest-control guidance. For an animal in your care, or any situation involving injury, contact a qualified veterinarian, your local wildlife authority, or emergency services.

Sources and further reading

Authoritative references used for general educational context. External links open in a new tab. These sources do not endorse FaunaHub.

UniversityAnimal Diversity Web — Zalophus californianus (California sea lion) — University of Michigan species account
UniversityAnimal Diversity Web — Otariidae (eared seals — sea lions and fur seals) — University of Michigan species account
GovernmentNOAA Fisheries — California Sea Lion — U.S. federal marine science agency species page
Wildlife referenceIUCN Red List of Threatened Species — Authoritative source for current conservation status
UniversityAnimal Diversity Web — Odobenus rosmarus (walrus) — University of Michigan species account
GovernmentNOAA Fisheries — Marine Life — U.S. government science agency for marine species and habitats
UniversityAnimal Diversity Web — University of Michigan Museum of Zoology — Peer-edited reference accounts for animal species

Last updated: 2026-08-04