Black-rumped Waxbill vs blue whale

Estrilda troglodytes compared with Balaenoptera musculus

Key Differences

• Black-rumped Waxbill is Least Concern while blue whale is Vulnerable.

Taxonomic Classification

Rank	Black-rumped Waxbill	blue whale
Kingdom same	Animalia (Animals)	Animalia (Animals)
Phylum same	Chordata (Chordates)	Chordata (Chordates)
Class	Aves (Birds)	Mammalia (Mammals)
Order	Passeriformes (Songbirds)	Cetacea (Whales & Dolphins)
Family	Estrildidae	Balaenopteridae (Rorquals)
Genus	Estrilda	Balaenoptera (Rorquals)
Species	Estrilda troglodytes	Balaenoptera musculus

Evolutionary Relationship

Black-rumped Waxbill and blue whale share a common ancestor at the Phylum level: Chordata. (Chordates)

Conservation Status

Black-rumped Waxbill

LC — Least Concern

blue whale

VU — Vulnerable

Population: ~15.0K

Trend: Increasing ↑

Physical Characteristics

Attribute	Black-rumped Waxbill	blue whale
Diet	—	Carnivore
Average Lifespan	—	90 years
Average Length	—	30.0 m
Average Weight	—	150.0 t

Habitat & Geographic Range

Black-rumped Waxbill

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Found across Asia (Japan) and Europe (8 countries).

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.

Black-rumped Waxbill

A small waxbill of semi-arid and dry scrubland habitats across sub-Saharan Africa and the Sahel zone, black-rumped waxbills have a distinctive crimson bill and rump that contrasts with their grey-brown body. They inhabit dry grasslands, savanna borders, and cultivated areas, feeding on small grass seeds. Though small and inconspicuous, they are a popular aviary bird kept throughout Europe and Asia for their delicate appearance and active, social behavior.

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 2 countries:

🇳🇴 Norway 🇵🇹 Portugal