Brazilian whitetail dogfish vs Polar bear

Squalus albicaudus compared with Ursus maritimus

Key Differences

• Brazilian whitetail dogfish is Data Deficient while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Brazilian whitetail dogfish	Polar bear
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum same	Chordata (脊索动物门)	Chordata (脊索动物门)
Class	Elasmobranchii	Mammalia (哺乳動物)
Order	Squaliformes (角鲨目)	Carnivora (食肉目)
Family	Squalidae	Ursidae (Bears)
Genus	Squalus	Ursus (Bears)
Species	Squalus albicaudus	Ursus maritimus

Evolutionary Relationship

Brazilian whitetail dogfish and Polar bear share a common ancestor at the Phylum level: Chordata. (脊索动物门)

Conservation Status

Brazilian whitetail dogfish

DD — Data Deficient

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Brazilian whitetail dogfish	Polar bear
Diet	—	Carnivore
Average Lifespan	—	25 years
Average Length	—	2.4 m
Average Weight	—	450.0 kg

Habitat & Geographic Range

Brazilian whitetail dogfish

Polar bear

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, temperate coniferous forests, and boreal forests and taiga, among 4 distinct biome types within the Palearctic biogeographic realm. Populations are also found in montane and highland environments at higher elevations.

Range

Found in Norway. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its range.

Brazilian whitetail dogfish

The Brazilian whitetail dogfish (Squalus albicaudus) is a species in the genus Squalus. It is currently classified as Data Deficient on the IUCN Red List.

Polar bear

北极熊是地球上最大的陆地食肉动物，体重可超过700千克，分布于从加拿大到俄罗斯的北极海冰区。是高度特化的海洋哺乳动物，依赖海冰捕猎环斑海豹和髯海豹。是优秀的游泳者，能够横渡广阔的开阔水域。被列为易危种，因气候变化导致北极海冰迅速减少，种群正受到严重威胁。