brown hydra vs Polar bear

Hydra oligactis compared with Ursus maritimus

Key Differences

• brown hydra is Not Evaluated while Polar bear is Vulnerable.

Taxonomic Classification

Rank	brown hydra	Polar bear
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum	Cnidaria (刺胞動物門)	Chordata (脊索动物门)
Class	Hydrozoa (水螅纲)	Mammalia (哺乳動物)
Order	Anthoathecata (花水母目)	Carnivora (食肉目)
Family	Hydridae	Ursidae (Bears)
Genus	Hydra	Ursus (Bears)
Species	Hydra oligactis	Ursus maritimus

Evolutionary Relationship

brown hydra and Polar bear share a common ancestor at the Kingdom level: Animalia. (动物界)

Conservation Status

brown hydra

NE — Not Evaluated

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

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

Habitat & Geographic Range

brown hydra

Habitat

Native to Europe, inhabiting ecosystems characteristic of the region.

Range

Distributed across Denmark, Norway, and Sweden.

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.

brown hydra

The Brown Hydra (Hydra oligactis) is a species in the genus Hydra. Native to Europe, inhabiting ecosystems characteristic of the region. Distributed across Denmark, Norway, and Sweden. As a member of the Hydra genus, this species contributes to biodiversity in its native range.

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