Photo: Marshal Hedin from San Diego · CC BY-SA 2.0 (Wikimedia Commons)
Scientific name
Enhydra lutris
Group
Marine mammals
Rarity
Rare
Where to see it
Cold / polar waters
Conservation status (IUCN)
Endangered
Did you know?
The sea otter has the densest fur of any animal, with several hundred thousand hairs packed into just a few square centimeters of skin that it must groom constantly since it lacks insulating blubber, and it uses rocks as tools to crack open shellfish.
What defines this group — Marine mammals
Warm-blooded, they nurse their young and breathe air — the group closest to us underwater.
They breathe through a blowhole (whales, dolphins) or nostrils (seals, sea lions).
A thick layer of blubber, rather than fur, insulates them from the cold.
Many navigate and hunt by sound, using echolocation.