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  1. Home
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  3. Sea Otter

One of the 8 otters on WAnimals

Sea Otter (Enhydra lutris)

Mammals · Carnivora · Mustelidae

Sea Otter

Enhydra lutris

Endangered

At very high risk of extinction in the wild in the near future.

Spotted something wrong?

It has the densest fur of any animal, with up to a million hairs per square inch, since it has no blubber and depends entirely on its coat for insulation against the cold.

Weight

15 kg – 45 kg

Size

1 m – 1.5 m

Life expectancy

17 years

Diet

Carnivore

Feeds mainly on other animals.

Activity

Diurnal

Active mainly during the day.

Social structure

Hierarchical pack

Lives in an organised hierarchical group, typical of cooperative hunters.

Sighting difficulty

Hard

Ocean
5countries6parks5dive sites28same family

AI-generated images: illustrations, not photographs.

Fun facts

  • It has the densest fur of any animal, with up to a million hairs per square inch.
  • It uses stones as tools to crack open the shells of its prey.
  • It wraps itself in kelp while it sleeps so it does not drift away.
  • comportamientoIt sleeps floating on its back and often holds paws with others, forming "rafts" so the group does not drift apart overnight.

Life cycle and biology

Skeleton type
Vertebrate - internal bony skeleton (mammal)
Habitat and environment
Kelp forests and rocky coastal waters of the North Pacific
Birth weight
1.4-2.3 kg at birth
Size at birth
1.4-2.3 kg at birth
Sexual maturity
Female: 3-5 years | Male: 5-6 years
Gestation / incubation
4-12 months in total with delayed implantation (4-5.5 months of active embryonic development)
Litter / clutch size
1 young per birth (twins rare)
Life expectancy in captivity
Documented record of up to 27 years

Sources consulted: AnAge (genomics.senescence.info); ResearchGate (predicting reproduction captive study); Sea Otter Foundation & Trust; Ivis.org; Animal Diversity Web; COSEWIC status report; FaunaFocus

Where to find it

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The pins mark the parks and dive sites where its presence is documented.

Where to see it

Parks and dive sites where this species has been documented.

Related species

Other species in the catalogue with the most in common with Sea Otter — same habitat, park, country, tags or family.

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How to help

The sea otter is classified as endangered. Organisations such as the IUCN, WWF and the Wildlife Conservation Society work specifically on its conservation and that of its habitat; looking into their programmes is a good starting point if you want to get involved.

It's documented in 7 protected areas — one reason why protecting these places matters for its conservation.

Related guides

Keep exploring

Based on what we already know about sea otter.

Comments

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See full glossary
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Where to see Sea Otter9 places
CountriesUnited States
ParksOlympicUnited States
TagsCarnivore
Carnivore
Diurnal
In packs
Endangered
Ocean
Mammal
United States
Canada
Russia
Japan
Mexico