Polar bear vs キアオジ

Ursus maritimus compared with Emberiza citrinella

Key Differences

  • Polar bear is Vulnerable while キアオジ is Near Threatened.

Taxonomic Classification

Rank Polar bear キアオジ
Kingdom same Animalia (動物) Animalia (動物)
Phylum same Chordata (脊索動物) Chordata (脊索動物)
Class Mammalia (哺乳類) Aves (鳥類)
Order Carnivora (ネコ目) Passeriformes (スズメ目)
Family Ursidae (Bears) Emberizidae
Genus Ursus (Bears) Emberiza
Species Ursus maritimus Emberiza citrinella

Evolutionary Relationship

Polar bear and キアオジ share a common ancestor at the Phylum level: Chordata. (脊索動物)

Conservation Status

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

キアオジ

NT — Near Threatened

Physical Characteristics

Attribute Polar bear キアオジ
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.

キアオジ

Habitat

Found across multiple habitat types including temperate broadleaf and mixed forests, tundra, and tropical and subtropical moist broadleaf forests spanning the Australasia and Oceanian realms.

Range

Found across Europe (5 countries) and Oceania and the Pacific (New Zealand). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

Polar bear

地球上で最大の陸上肉食動物であるホッキョクグマは700kgを超えることがあり、カナダからロシアまでの北極海氷域全体に分布する。ワモンアザラシとヒゲアザラシを狩るために海氷に依存する高度に特化した海洋哺乳類である。広大な距離を泳ぐことができる優れた泳者でもある。脆弱種に指定されており、気候変動による急激な北極海氷の消失で個体群が深刻な圧力を受けている。

キアオジ

キアオジ(Emberiza citrinella)はIUCNレッドリストで準絶滅危惧(NT)に分類されています。ヨーロッパと西アジアの開けた耕作地、生け垣、林縁に生息する小型のホオジロ類で、雄の鮮やかな黄色の頭部と胸が特徴です。農業の集約化による食物減少と生息地変化により、ヨーロッパ各地で急激に減少しています。

Shared Countries

Both species can be found in 1 countries:

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