A southern sea otter (Enhydra lutris nereis) floating on its back at the water surface. ← All animals

mammal · Enhydra lutris

Sea otter

“SEE OT-er”

Why we love them

The sea otter is a furry ocean animal that lives along the cold coasts of the North Pacific. It belongs to the same family as weasels and river otters, and it is the heaviest of them all. Even so, it is one of the smallest sea mammals in the world.

Most sea mammals have a thick layer of fat to keep warm, but the sea otter has something different: fur. In fact, sea otters have the thickest fur of any animal on Earth. This dense, cozy coat traps warmth and keeps the otter snug in the chilly water.

Sea otters are clever eaters. They dive down to the sea floor to look for food like sea urchins, crabs, and clams. A sea otter can even use a small rock like a tool, tapping it against a shell to crack it open and reach the tasty bit inside.

Mealtime for a sea otter is a special sight. It floats on its back at the surface and eats with its front paws resting on its tummy. It even has a loose pouch of skin under its arm, like a little pocket, where it can tuck food and its favourite rock.

Long ago, huge numbers of sea otters were hunted for their warm fur, and very few were left. Laws now protect them, and their numbers have slowly grown in some places. They still need our help, because dangers like oil spills and sickness can harm them, so people keep working hard to look after these playful sea animals.

My home

Coast, kelp forest, ocean, rocky shore

Where I live

Asia, North America

What I eat

Sea urchins, crabs, clams, mussels, snails, fish

How heavy I am

14–45 kg

Sea otters have the thickest fur of any animal on Earth, which keeps them warm in the cold sea.

A sea otter can use a small rock like a tool to crack open a shell for its dinner.

Sea otters often eat while floating on their backs, and they tuck food into a pouch of loose skin under their arm.

Every sea otter can feel happy, scared and loved — just like you.

Looking after my friends

How many are there?

A late-1990s compilation estimated about 126,000 sea otters across North America and Russia.

This is a dated compilation; regional populations have changed substantially since then.

Estimate source: Sea otter recovery strategy: population and distribution

How are they doing?

Endangered

This species has a very high risk of extinction in the wild, so protecting it matters greatly.

Official status: endangered (IUCN)

You can help by learning their names, keeping wild places clean, and telling someone why this animal matters.

Where this came from