Blackhead worm vs Polar bear

Aporrectodea longa compared with Ursus maritimus

Key Differences

Blackhead worm is Not Evaluated while Polar bear is Vulnerable.

Taxonomic Classification

Rank	Blackhead worm	Polar bear
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum	Annelida (環形動物)	Chordata (脊索動物)
Class	Clitellata (環帯類)	Mammalia (哺乳類)
Order	Crassiclitellata (Crassiclitellata)	Carnivora (ネコ目)
Family	Lumbricidae	Ursidae (Bears)
Genus	Aporrectodea	Ursus (Bears)
Species	Aporrectodea longa	Ursus maritimus

Evolutionary Relationship

Blackhead worm and Polar bear share a common ancestor at the Kingdom level: Animalia. (動物)

表示 Kingdom: Animalia

Conservation Status

Blackhead worm

NE — Not Evaluated

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Blackhead worm	Polar bear
Diet	—	Carnivore
Average Lifespan	—	25 years
Average Length	—	2.4 m
Average Weight	—	450.0 kg

Habitat & Geographic Range

Blackhead worm

Habitat

Native to Europe and North America, inhabiting ecosystems characteristic of the region.

Range

Distributed across Belgium, Denmark, Norway, Sweden, and United States.

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.

Blackhead worm

The Blackhead worm (Aporrectodea longa) is a species in the genus Aporrectodea. Native to Europe and North America, inhabiting ecosystems characteristic of the region. Distributed across Belgium, Denmark, Norway, Sweden, and United States.

Polar bear

地球上で最大の陸上肉食動物であるホッキョクグマは700kgを超えることがあり、カナダからロシアまでの北極海氷域全体に分布する。ワモンアザラシとヒゲアザラシを狩るために海氷に依存する高度に特化した海洋哺乳類である。広大な距離を泳ぐことができる優れた泳者でもある。脆弱種に指定されており、気候変動による急激な北極海氷の消失で個体群が深刻な圧力を受けている。