Polar bear vs Small Kidney Fern

Ursus maritimus compared with Dryopteris napoleonis

Key Differences

• Polar bear is Vulnerable while Small Kidney Fern is Endangered.

Taxonomic Classification

Rank	Polar bear	Small Kidney Fern
Kingdom	Animalia (动物界)	Plantae (植物)
Phylum	Chordata (脊索动物门)	Tracheophyta
Class	Mammalia (哺乳動物)	Polypodiopsida (水龍骨綱)
Order	Carnivora (食肉目)	Polypodiales (水龙骨目)
Family	Ursidae (Bears)	Dryopteridaceae
Genus	Ursus (Bears)	Dryopteris
Species	Ursus maritimus	Dryopteris napoleonis

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Small Kidney Fern

EN — Endangered

Physical Characteristics

Attribute	Polar bear	Small Kidney Fern
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.

Small Kidney Fern

Habitat

Typically found in moist, shaded forest floors and tropical canopies.

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。