blue whale vs Hairy-nosed otter

Balaenoptera musculus compared with Lutra sumatrana

Key Differences

• blue whale is Vulnerable while Hairy-nosed otter is Endangered.

Taxonomic Classification

Rank	blue whale	Hairy-nosed otter
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class same	Mammalia (Mammals)	Mammalia (Mammals)
Order	Cetacea (Whales & Dolphins)	Carnivora (Carnivorans)
Family	Balaenopteridae (Rorquals)	Mustelidae (Weasels & Otters)
Genus	Balaenoptera (Rorquals)	Lutra (Otters)
Species	Balaenoptera musculus	Lutra sumatrana

Evolutionary Relationship

blue whale and Hairy-nosed otter share a common ancestor at the Class level: Mammalia. (Mammals)

Conservation Status

blue whale

VU — Vulnerable

Population: ~15.0K

Trend: Increasing ↑

Hairy-nosed otter

EN — Endangered

Physical Characteristics

Attribute	blue whale	Hairy-nosed otter
Diet	Carnivore	—
Average Lifespan	90 years	—
Average Length	30.0 m	—
Average Weight	150.0 t	—

Habitat & Geographic Range

blue whale

Habitat

Found across multiple habitat types including tropical and subtropical moist broadleaf forests, tropical and subtropical dry broadleaf forests, and tropical and subtropical grasslands and savannas, among 11 distinct biome types. Populations are also found in montane and highland environments at higher elevations.

Range

Widely distributed across Asia (Taiwan), Europe (4 countries), and South America (Colombia, Ecuador). Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Hairy-nosed otter

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

blue whale

The largest animal ever known to have lived on Earth, blue whales can reach 33 meters and 200 tonnes — their hearts alone weigh as much as a small car. Found in all oceans, they migrate between polar feeding grounds and tropical breeding areas. Filter feeders consuming up to 4 tonnes of krill daily. Endangered, with global populations estimated at 10,000–25,000 after near-extinction from 20th-century whaling.