Polar bear vs Saltwater Crocodile

Ursus maritimus compared with Crocodylus porosus

Key Differences

• Polar bear is Vulnerable while Saltwater Crocodile is Least Concern.
• Saltwater Crocodile is 2.2x heavier than Polar bear.
• Saltwater Crocodile lives longer (70 years vs 25 years).

Taxonomic Classification

Rank	Polar bear	Saltwater Crocodile
Kingdom same	Animalia (动物界)	Animalia (动物界)
Phylum same	Chordata (脊索动物门)	Chordata (脊索动物门)
Class	Mammalia (哺乳動物)	Reptilia (爬行纲)
Order	Carnivora (食肉目)	Crocodylia (Crocodilians)
Family	Ursidae (Bears)	Crocodylidae (Crocodiles)
Genus	Ursus (Bears)	Crocodylus (True Crocodiles)
Species	Ursus maritimus	Crocodylus porosus

Evolutionary Relationship

Polar bear and Saltwater Crocodile share a common ancestor at the Phylum level: Chordata. (脊索动物门)

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Saltwater Crocodile

LC — Least Concern

Population: ~300.0K

Trend: Stable →

Physical Characteristics

Attribute	Polar bear	Saltwater Crocodile
Diet	Carnivore	Carnivore
Average Lifespan	25 years	70 years
Average Length	2.4 m	6.0 m
Average Weight	450.0 kg	1.0 t

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.

Saltwater Crocodile

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Distributed across Australia, India, Indonesia, Malaysia, and Philippines.

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。

Saltwater Crocodile

湾鳄(Crocodylus porosus)是现存最大的爬行动物，分布于印度东部至澳大利亚北部。