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Otter vs. Seal — What's the Difference?

By Tayyaba Rehman — Updated on October 14, 2023
Otters are slender, semi-aquatic mammals with webbed feet and dense fur, while seals are marine mammals with flippers and blubbery bodies adapted for ocean living.
Otter vs. Seal — What's the Difference?

Difference Between Otter and Seal

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Key Differences

Otters belong to the weasel family and possess a slender, elongated body with dense fur which traps a layer of air to insulate them from cold waters. Seals, in contrast, are part of the pinniped family, sharing characteristics with sea lions and walruses, and have a layer of blubber that provides buoyancy and insulation.
The habitats of otters can vary; some otters, like river otters, dwell primarily in freshwater environments, while sea otters inhabit coastal marine regions. Seals, however, are predominantly marine mammals, spending much of their life in the ocean, though they come ashore on land or ice to rest, molt, and give birth.
When observing their limbs, otters have webbed feet which assist in swimming and are more adapted for versatile movement on land as well. Seals possess flippers, making them adept swimmers in the ocean but somewhat clumsy movers on land.
Feeding habits also differ between otters and seals. Otters primarily consume fish and invertebrates, using their agile front paws to capture and manipulate prey. Seals, with a diet comprising mainly fish and squid, swallow their food whole, using their sharp teeth to grasp rather than chew.
Both otters and seals have streamlined bodies, facilitating efficient movement in water. However, otters have a more playful demeanor, often seen sliding on mud banks or snow, while seals are better known for their lounging behavior on rocks and beaches.
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Comparison Chart

Family

Belongs to the weasel family.
Part of the pinniped family.

Habitat

Found in both freshwater and marine environments.
Predominantly marine mammals.

Body Structure

Slender body with dense fur.
Blubbery body with flippers.

Movement

Versatile on land with webbed feet for swimming.
Adept swimmers but clumsy on land.

Diet

Consumes fish and invertebrates, uses paws to handle prey.
Eats mainly fish and squid, swallows food whole.

Compare with Definitions

Otter

A member of the weasel family, adept at swimming.
The otter dived into the river, chasing after a fish.

Seal

A marine mammal with a blubbery body and flippers.
The seal basked in the sun on a rocky shore.

Otter

A mammal with sharp teeth and webbed feet for catching prey.
The otter used its sharp teeth to crunch through the crab's shell.

Seal

A member of the pinniped family, often found on coasts.
The beach was a popular resting place for seals during the mating season.

Otter

A creature that can inhabit both freshwater and marine environments.
We observed sea otters in the coastal region and river otters in the estuary.

Seal

An aquatic animal known for its streamlined body aiding efficient swimming.
The seal dove deep into the water, hunting for fish.

Otter

A carnivorous mammal known for its playful behavior.
The child was delighted watching the otter juggle pebbles with its paws.

Seal

A mammal with a diet comprising primarily of fish and squid.
The seal caught a large fish and swallowed it whole.

Otter

Otters are carnivorous mammals in the subfamily Lutrinae. The 13 extant otter species are all semiaquatic, aquatic or marine, with diets based on fish and invertebrates.

Seal

A device or material that is used to close off or fasten an opening or connection, especially to prevent the escape of a liquid or gas
Used caulk as a seal around the window.

Otter

A semiaquatic fish-eating mammal of the weasel family, with an elongated body, dense fur, and webbed feet.

Seal

An airtight closure
A door that lacks a tight seal.

Otter

A piece of board used to carry fishing bait in water.

Seal

Something, such as a piece of tape, that is placed on a product or package to show that the contents have not been tampered with.

Otter

Any of various aquatic or semiaquatic carnivorous mammals of the mustelid subfamily Lutrinae, having webbed feet and dense, dark brown fur.

Seal

The water in the trap of a drain that prevents sewer gas from escaping into a room.

Otter

The fur of one of these animals.

Seal

A design used to identify a person or thing or to show that something is authentic, accurate, or of good quality
The title page is marked with the publisher's seal. Does the scale have the inspector's seal?.

Otter

An aquatic or marine carnivorous mammal in the subfamily Lutrinae of the family Mustelidae, which also includes weasels, polecats, badgers, and others.

Seal

A small decorative paper sticker.

Otter

(gay slang) A hairy man with a slender physique, in contrast with a bear, who is more thickset.

Seal

A die or signet having a raised or incised emblem used to stamp an impression on a receptive substance such as wax or lead.

Otter

(obsolete) annatto dye

Seal

The impression so made.

Otter

Any carnivorous animal of the genera Lutra, Enhydra, and related genera of the family Mustelidae. Several species are described. They have large, flattish heads, short ears, and webbed toes. They are aquatic, and feed on fish. The sea otter (Enhydra lutris) also eats clams, crabs, starfish, abalone, and other marine animals; they may come to the surface, and lying on their backs using the stomach as a table, may be seen cracking open the shell of its prey with a rock. The common otter of Europe is Lutra vulgaris; the North American otter (or American otter) is Lutra Canadensis, which inhabits marshes, streams and rivers; other species inhabit South America and Asia. The North American otter adult is about three to four feet long (including the tail) and weighs from 10 to 30 pounds; the sea otter is commonly four feet long and 45 pounds (female) or 60 pounds (male). Their fur is soft and valuable, and in the nineteenth century they were hunted extensively. The sea otter was hunted to near extinction by 1900, and is now protected. Fewer than 3,000 sea otters are believed to live along the central California coast.

Seal

The design or emblem itself, belonging exclusively to the user
A monarch's seal.

Otter

The larva of the ghost moth. It is very injurious to hop vines.

Seal

A small disk or wafer of wax, lead, or paper bearing such an imprint and affixed to a document to prove authenticity or to secure it.

Otter

A corruption of Annotto.

Seal

An indication or symbol regarded as guaranteeing or authenticating something
The choral director gave the program his seal of approval.

Otter

The fur of an otter

Seal

Any of various aquatic carnivorous mammals of the families Phocidae and Otariidae, found chiefly in cold regions and having a sleek torpedo-shaped body and limbs that are modified into paddlelike flippers.

Otter

Freshwater carnivorous mammal having webbed and clawed feet and dark brown fur

Seal

The pelt or fur of one of these animals, especially a fur seal.

Otter

A semi-aquatic mammal with a slender body and dense fur.
The otter slid playfully down the muddy bank into the water.

Seal

Leather made from the hide of one of these animals.

Seal

To close or fasten with a seal
Seal an envelope.
Seal a test tube.

Seal

To prevent (a liquid or gas) from escaping
Charring a piece of meat seals in the juices.

Seal

To cover, secure, or fill up (an opening)
Sealed the hole in the pipe with epoxy.

Seal

To apply a waterproof coating to
Seal a blacktop driveway.

Seal

To secure or prevent passage into and out of (an area). Often used with off
The police sealed off the crime scene.

Seal

To affix a seal to (something) in order to prove authenticity, accuracy, or quality.

Seal

To establish or determine irrevocably
Our fate was sealed.

Seal

Mormon Church To make (a marriage, for example) eternally binding; solemnize forever.

Seal

To hunt seals.

Seal

A pinniped (Pinnipedia), particularly an earless seal (true seal) or eared seal.
The seals in the harbor looked better than they smelled.

Seal

(heraldry) A bearing representing a creature something like a walrus.

Seal

A stamp used to impress a design on a soft substance such as wax.

Seal

An impression of such stamp on wax, paper or other material used for sealing.

Seal

A design or insignia usually associated with an organization or an official role.
The front of the podium bore the presidential seal.

Seal

Anything that secures or authenticates.

Seal

Something which will be visibly damaged if a covering or container is opened, and which may or may not bear an official design.
The result was declared invalid, as the seal on the meter had been broken.

Seal

(figurative) Confirmation or approval, or an indication of this.
Her clothes always had her mom's seal of approval.

Seal

Something designed to prevent liquids or gases from leaking through a joint.
The canister is leaking. I think the main seal needs to be replaced.

Seal

A tight closure, secure against leakage.
Close the lid tightly to get a good seal.

Seal

A chakra. en

Seal

(intransitive) To hunt seals.
They're organizing a protest against sealing.

Seal

(transitive) To place a seal on (a document).

Seal

To mark with a stamp, as an evidence of standard exactness, legal size, or merchantable quality.
To seal weights and measures
To seal silverware

Seal

(transitive) To fasten (something) so that it cannot be opened without visible damage.
The cover is sealed. If anyone tries to open it, we'll know about it.

Seal

(transitive) To prevent people or vehicles from crossing (something).
The border has been sealed until the fugitives are found.

Seal

(transitive) To close securely to prevent leakage.
I've sealed the bottle to keep the contents fresh.

Seal

(transitive) To place in a sealed container.
I've sealed the documents in this envelope.

Seal

To place a notation of one's next move in a sealed envelope to be opened after an adjournment.
After thinking for half an hour, the champion sealed his move.

Seal

(transitive) To guarantee.
The last-minute goal sealed United’s win.

Seal

To fix, as a piece of iron in a wall, with cement or plaster, etc.

Seal

To close by means of a seal.
To seal a drainpipe with water

Seal

(Mormonism) To confirm or set apart as a second or additional wife.

Seal

(Christianity) To form a sacred commitment.

Seal

To fry (meat) at a high temperature to retain the juices.

Seal

(dialectal) To tie up animals (especially cattle) in their stalls.

Seal

Any aquatic carnivorous mammal of the families Phocidæ and Otariidæ.

Seal

An engraved or inscribed stamp, used for marking an impression in wax or other soft substance, to be attached to a document, or otherwise used by way of authentication or security.

Seal

Wax, wafer, or other tenacious substance, set to an instrument, and impressed or stamped with a seal; as, to give a deed under hand and seal.
Till thou canst rail the seal from off my bondThou but offend'st thy lungs to speak so loud.

Seal

That which seals or fastens; esp., the wax or wafer placed on a letter or other closed paper, etc., to fasten it.

Seal

That which confirms, ratifies, or makes stable; that which authenticates; that which secures; assurance.
Like a red seal is the setting sunOn the good and the evil men have done.

Seal

An arrangement for preventing the entrance or return of gas or air into a pipe, by which the open end of the pipe dips beneath the surface of water or other liquid, or a deep bend or sag in the pipe is filled with the liquid; a draintrap.

Seal

To set or affix a seal to; hence, to authenticate; to confirm; to ratify; to establish; as, to seal a deed.
And with my hand I seal my true heart's love.

Seal

To mark with a stamp, as an evidence of standard exactness, legal size, or merchantable quality; as, to seal weights and measures; to seal silverware.

Seal

To fasten with a seal; to attach together with a wafer, wax, or other substance causing adhesion; as, to seal a letter.

Seal

Hence, to shut close; to keep close; to make fast; to keep secure or secret.
Seal up your lips, and give no words but "mum".

Seal

To fix, as a piece of iron in a wall, with cement, plaster, or the like.

Seal

To close by means of a seal; as, to seal a drainpipe with water. See 2d Seal, 5.

Seal

Among the Mormons, to confirm or set apart as a second or additional wife.
If a man once married desires a second helpmate . . . she is sealed to him under the solemn sanction of the church.

Seal

To affix one's seal, or a seal.
I will seal unto this bond.

Seal

Fastener consisting of a resinous composition that is plastic when warm; used for sealing documents and parcels and letters

Seal

A device incised to make an impression; used to secure a closing or to authenticate documents

Seal

The pelt or fur (especially the underfur) of a seal;
A coat of seal

Seal

A member of a Naval Special Warfare unit who is trained for unconventional warfare;
SEAL is an acronym for Sea Air and Land

Seal

A stamp affixed to a document (as to attest to its authenticity or to seal it);
The warrant bore the sheriff's seal

Seal

An indication of approved or superior status

Seal

A finishing coat applied to exclude moisture

Seal

Fastener that provides a tight and perfect closure

Seal

Any of numerous marine mammals that come on shore to breed; chiefly of cold regions

Seal

Close with or as if with a seal;
She sealed the letter with hot wax

Seal

Make tight; secure against leakage;
Seal the windows

Seal

Decide irrevocably;
Sealing dooms

Seal

Affix a seal to;
Seal the letter

Seal

Cover with varnish

Seal

Hunt seals

Seal

An animal that comes ashore to rest, molt, and reproduce.
Every year, the seals return to this beach to give birth to their pups.

Common Curiosities

Which family does the otter belong to?

The otter belongs to the weasel family.

Which animal possesses a layer of blubber for insulation?

Seals possess a layer of blubber for insulation.

What type of environment do seals predominantly inhabit?

Seals predominantly inhabit marine environments.

How do otters use their paws differently than seals use their flippers?

Otters use their agile paws to capture and manipulate prey, while seals use their flippers mainly for swimming.

Which one is more versatile in movement on land, otter or seal?

The otter is more versatile in movement on land compared to the seal.

Are there otters that live in marine environments?

Yes, sea otters are a type of otter that lives in marine environments.

What is a primary difference in the feeding habits of otters and seals?

Otters primarily consume fish and invertebrates and use their paws to handle prey, while seals mainly eat fish and squid, swallowing their food whole.

How do seals rest or reproduce?

Seals come ashore on land or ice to rest, molt, and reproduce.

Which mammal is known for a playful demeanor and sliding behavior?

Otters are known for their playful demeanor and sliding behavior.

What family do seals belong to?

Seals belong to the pinniped family.

How does the body structure of an otter differ from a seal?

Otters have a slender, elongated body with dense fur, while seals have a blubbery body with flippers.

Are all otters freshwater animals?

No, while some otters like river otters are freshwater animals, others like sea otters inhabit marine environments.

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Author Spotlight

Written by
Tayyaba Rehman
Tayyaba Rehman is a distinguished writer, currently serving as a primary contributor to askdifference.com. As a researcher in semantics and etymology, Tayyaba's passion for the complexity of languages and their distinctions has found a perfect home on the platform. Tayyaba delves into the intricacies of language, distinguishing between commonly confused words and phrases, thereby providing clarity for readers worldwide.

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