Polar bear vs Thorny Sea Pen

Ursus maritimus compared with Pennatula aculeata

Key Differences

• Polar bear is Vulnerable while Thorny Sea Pen is Not Evaluated.

Taxonomic Classification

Rank	Polar bear	Thorny Sea Pen
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum	Chordata (脊索动物门)	Cnidaria (刺胞動物門)
Class	Mammalia (哺乳動物)	Anthozoa
Order	Carnivora (食肉目)	Scleralcyonacea (鈣軸硬珊瑚目)
Family	Ursidae (Bears)	Pennatulidae
Genus	Ursus (Bears)	Pennatula
Species	Ursus maritimus	Pennatula aculeata

Evolutionary Relationship

Polar bear and Thorny Sea Pen share a common ancestor at the Kingdom level: Animalia. (动物界)

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Thorny Sea Pen

NE — Not Evaluated

Physical Characteristics

Attribute	Polar bear	Thorny Sea Pen
Diet	Carnivore	—
Average Lifespan	25 years	—
Average Length	2.4 m	—
Average Weight	450.0 kg	—

Habitat & Geographic Range

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.

Thorny Sea Pen

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, Portugal, and Sweden.

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。

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway