Enhydra Lutris

Sea Otter

Coastal waters, kelp forests, rocky shorelines

The Sea Otter is a marine mammal known for its dense fur, which is the thickest of any animal, with up to a million hairs per square inch. This fur provides essential insulation, as they lack blubber like other marine mammals. They are highly adapted to aquatic life, with webbed feet for swimming and strong forepaws used for foraging. Adult males can weigh up to 45 kg, making them the heaviest members of the weasel family.

Sea Otter
Population:Estimated 100,000 - 150,000 individuals
Generation Length:10-12 years
Average Weight:22-45 kg (males), 14-33 kg (females)
Average Length:1.2-1.5 meters
Lifespan:10-20 years in the wild, up to 25 years in captivity
Diet:Strictly carnivorous, eating mostly marine invertebrates
Conservation Status:Endangered (EN)
Echological Profile

Sea Otters are social animals, often found floating in groups called rafts. These groups help them stay safe from predators and strong ocean currents. They spend most of their lives in the water, eating, grooming, and even sleeping while floating on their backs. They use their thick fur to trap air, keeping them buoyant and warm in cold waters. Unlike most marine mammals, they rely on grooming their fur to maintain warmth rather than storing fat.

As carnivorous predators, Sea Otters primarily feed on marine invertebrates such as sea urchins, mollusks, and crabs. They are one of the few animal species known to use tools, using rocks to crack open shellfish. Their diet plays a crucial role in maintaining the health of kelp forests by controlling sea urchin populations, which, if left unchecked, can devastate kelp ecosystems.

Mating occurs year-round, with males competing for females. After a gestation period of 4-6 months, mothers give birth to a single pup, which they nurture with great care. Pups are born with a thick coat of fur that keeps them buoyant, and mothers carry them on their chests while grooming and feeding them. The pup remains dependent on its mother for several months before learning to dive and hunt on its own.

Although Sea Otter populations are recovering in some areas, they remain endangered in others due to habitat destruction, oil spills, and climate change. Their fur was highly valued in the fur trade, which nearly drove them to extinction in the 19th century. Conservation efforts, including legal protections and habitat restoration, have helped stabilize some populations, but ongoing threats still pose challenges to their survival.

A Taxonomy for All Living Things
Classifications
Domain
Eukaryota
Kingdom
Animalia
Phylum
Chordata
Class
Mammalia
Family
Mustelidae
Genus
Enhydra
The Key Attributes

Features

  • Movement:

    Aquatic and semi-terrestrial

  • Territorial Behavior:

    Social, forming loose groups called rafts

  • Speed:

    Up to 9 km/h in water

  • Diet:

    Carnivore


  • Physical Features:
    • Dense fur with up to a million hairs per square inch
    • Webbed feet for swimming
    • Strong front paws for cracking shells
    • Buoyant body for floating on water
  • Primary Senses:
    • Sight
    • Hearing
    • Touch
Understanding Habitat and Range

Geography

  • Habitat:

    Coastal waters, kelp forests, rocky shorelines

  • Migration Patterns:

    Non-migratory, but may move locally for food

  • Geographical Range:

    North Pacific, from Russia to California

  • Climate Preferences:

    Cold, temperate marine environments

Navigating the Wilderness

In the wild

  • Predators:

    Orcas, sharks, bald eagles (pups)

  • Prey:

    Sea urchins, mollusks, crabs, fish

  • Feeding Behavior:

    Forages underwater, using tools like rocks to break shells

  • Diet:

    Strictly carnivorous, eating mostly marine invertebrates


  • Defensive Mechanisms:
    • Thick fur for insulation
    • Floating on backs to keep warm
    • Strong swimming ability to evade predators
  • Preferred Food Sources:
    • Sea urchins
    • Crabs
    • Clams
    • Fish
Insights Into Reproduction

Mating

  • Mating System:

    Polygynous

  • Number of Offspring:

    Usually one pup per birth

  • Gestation Period:

    4-6 months (delayed implantation possible)


  • Parental Involvement:
    • Mothers raise pups alone
    • Pups ride on their mother's chest for warmth and protection
Wild Fun for Young Explorers
Youngsters Section
Sea Otter
Fun Fact

Sea Otters use rocks as tools to break open shellfish, making them one of the few tool-using mammals.

They wrap themselves in kelp while sleeping to avoid drifting away in ocean currents, ensuring they stay in one place.

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