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🧬 Biological Classification (Kingdom to Species)Enhydra lutris

Kingdom

Animalia

Phylum

Chordata

Class

Mammalia

Order

Carnivora

Family

Mustelidae

Genus

Enhydra

Species

Enhydra lutris

Mammalia🌊 Marine predator / filter feeder

Sea Otter

Enhydra lutris (Sea Otter · ラッコ)

🛡️ Conservation Status (IUCN Red List)EN (Endangered)

DDData Deficient

LCLeast Concern

NTNear Threatened

VUVulnerable

ENEndangered

CRCritically End.

EWExtinct in Wild

EXExtinct

Geological Era

Extant

Diet

Marine predator / filter feeder

Length · Height

1.2~1.5m · 40cm

Mass · Top Speed

14~45kg · 9~15km/h

Habitat & Fossil Locality

Coastal kelp forests of the North Pacific

💡 Everyday Comparisons for Size, Mass & Speed

📏 Length 1.2m — ~0.7× the height of a 1.75 m adult human
⚖️ Mass 14kg — Equivalent to ~7 two-liter water bottles (2 kg each)
⚡ Speed 9km/h — ~2.3× human walking speed (~4 km/h)

Reference standards: coach bus ~12 m, mid-size car ~4.9 m, compact car ~1 t, basketball hoop 3.05 m, credit card 8.56 cm.

📊 Mass & Speed Index (0–100)

⚖️ Mass Index (Blue Whale ~190 t = 100, log scale)50

⚡ Speed Index (400 km/h = 100)2

Site-computed relative index from recorded values; not a formal scientific metric.

#해달#Enhydra lutris#도구사용#핵심종

📖 1. Overview

It is a tool-using marine mammal that places stones on its belly to crack open clams and sea urchins, and a famous keystone species known for sleeping floating on its back while holding paws.

🌐 Wikipedia Summary Extract
The sea otter is a marine mammal native to the coasts of the northern and eastern North Pacific Ocean. Adult sea otters typically weigh between 14 and 45 kg (30–100 lb), making them the heaviest members of the weasel family, but among the smallest marine mammals. Unlike most marine mammals, the sea otter's primary form of insulation is an exceptionally thick coat of fur, the densest in the animal kingdom. Although it can walk on land, the sea otter is capable of living exclusively in the ocean.
Source: Wikipedia · CC BY-SA 4.0 · retrieved 2026-10-24

🦴 2. Anatomy & Morphology

With 150,000 hairs per 1 cm², it has the densest fur of any animal on Earth, and it carries its favorite personal stone in a loose pouch of skin under its armpit.

🔍 3. Ecology & Behavior

Because sea otters must prey on sea urchins to prevent kelp forests from being devastated, they are cited in ecology textbooks as the primary example of a keystone species.