Polar bear vs St. James' shell

Ursus maritimus compared with Pecten maximus

Key Differences

• Polar bear is Vulnerable while St. James' shell is Least Concern.

Taxonomic Classification

Rank	Polar bear	St. James' shell
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum	Chordata (脊索动物门)	Mollusca (软体动物门)
Class	Mammalia (哺乳動物)	Bivalvia (双壳纲)
Order	Carnivora (食肉目)	Pectinida (扇贝目)
Family	Ursidae (Bears)	Pectinidae
Genus	Ursus (Bears)	Pecten
Species	Ursus maritimus	Pecten maximus

Evolutionary Relationship

Polar bear and St. James' shell share a common ancestor at the Kingdom level: Animalia. (动物界)

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

St. James' shell

LC — Least Concern

Physical Characteristics

Attribute	Polar bear	St. James' shell
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.

St. James' shell

Habitat

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

Range

Widely distributed across Asia (China), Europe (8 countries), and South America (Chile).

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。

St. James' shell

圣雅各贝（Pecten maximus）在IUCN红色名录中被列为无危（LC）。在其分布范围内广泛分布，种群数量稳定，没有直接的保护关切。

Shared Countries

Both species can be found in 1 countries:

🇳🇴 Norway