Polar bear vs

Ursus maritimus compared with Stephanoeca kentii

Key Differences

• Polar bear is Vulnerable while is Not Evaluated.

Taxonomic Classification

Rank	Polar bear
Kingdom	Animalia (动物界)	Protozoa (原生動物)
Phylum	Chordata (脊索动物门)	Choanozoa (領鞭毛動物)
Class	Mammalia (哺乳動物)	Choanoflagellatea (领鞭毛虫纲)
Order	Carnivora (食肉目)	Choanoflagellida (颌鞭目)
Family	Ursidae (Bears)	Acanthoecidae
Genus	Ursus (Bears)	Stephanoeca
Species	Ursus maritimus	Stephanoeca kentii

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

NE — Not Evaluated

Physical Characteristics

Attribute	Polar bear
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.

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Norway 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。

Stephanoeca kentii是一种有壳领鞭毛虫，是一种海洋单细胞生物，能在细胞周围构建由硅酸盐条带组成的精巧篮状结构（壳笼）。它栖息于近岸和大洋海域，以微微浮游生物中的细菌为食。像本种这样的领鞭毛虫因作为动物最近亲的现生单细胞生物而具有科学研究价值。

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway