Polar bear vs 白腹林星蜂鳥

Ursus maritimus compared with Chaetocercus mulsant

Key Differences

Polar bear is Vulnerable while 白腹林星蜂鳥 is Least Concern.

Taxonomic Classification

Rank	Polar bear	白腹林星蜂鳥
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)	Aves (鳥綱)
Order	Carnivora (食肉目)	Apodiformes (雨燕目)
Family	Ursidae (Bears)	Trochilidae
Genus	Ursus (Bears)	Chaetocercus
Species	Ursus maritimus	Chaetocercus mulsant

Evolutionary Relationship

Polar bear and 白腹林星蜂鳥 share a common ancestor at the Phylum level: Chordata. (脊索动物门)

查看 Phylum: Chordata

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

白腹林星蜂鳥

LC — Least Concern

Physical Characteristics

Attribute	Polar bear	白腹林星蜂鳥
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.

白腹林星蜂鳥

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Distributed across Colombia, Ecuador, and Norway.

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。

白腹林星蜂鳥

白腹林星蜂鸟（Chaetocercus mulsant）是栖息于哥伦比亚至玻利维亚安第斯山脉及山间谷地的小型林星蜂鸟，雄鸟体重仅约2.5克，是体型最小的蜂鸟之一。雄鸟展示艳丽的紫红色喉斑、白色腹部和绿色胁部。见于海拔1,500至3,500米的林缘和花园。尽管体型娇小，却颇具攻击性且机动灵活，夜间进入蛰伏状态以在寒冷的安第斯环境中节省能量。