Arctic barrel-bubble vs blue whale

Retusa obtusa compared with Balaenoptera musculus

Key Differences

• Arctic barrel-bubble is Least Concern while blue whale is Vulnerable.

Taxonomic Classification

Rank	Arctic barrel-bubble	blue whale
Kingdom same	Animalia (hewan)	Animalia (hewan)
Phylum	Mollusca (Moluska)	Chordata (Chordates)
Class	Gastropoda (siput)	Mammalia (mamalia)
Order	Cephalaspidea (Cephalaspidea)	Cetacea (Whales & Dolphins)
Family	Retusidae	Balaenopteridae (Rorquals)
Genus	Retusa	Balaenoptera (Rorquals)
Species	Retusa obtusa	Balaenoptera musculus

Evolutionary Relationship

Arctic barrel-bubble and blue whale share a common ancestor at the Kingdom level: Animalia. (hewan)

Conservation Status

Arctic barrel-bubble

LC — Least Concern

blue whale

VU — Vulnerable

Population: ~15.0K

Trend: Increasing ↑

Physical Characteristics

Attribute	Arctic barrel-bubble	blue whale
Diet	—	Carnivore
Average Lifespan	—	90 years
Average Length	—	30.0 m
Average Weight	—	150.0 t

Habitat & Geographic Range

Arctic barrel-bubble

Habitat

Typically found in terrestrial and aquatic habitats including forests and freshwater.

Range

Distributed across Belgium, Denmark, Norway, and Sweden.

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.

Arctic barrel-bubble

The Arctic barrel-bubble (Retusa obtusa) is a species in the genus Retusa. It is currently classified as Least Concern on the IUCN Red List. Typically found in terrestrial and aquatic habitats including forests and freshwater.

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.

Shared Countries

Both species can be found in 3 countries:

🇩🇰 Denmark 🇳🇴 Norway 🇸🇪 Sweden