koala vs Polar bear

Phascolarctos cinereus compared with Ursus maritimus

Key Differences

  • koala is herbivore while Polar bear is carnivore.
  • Polar bear is 45.0x heavier than koala.
  • Polar bear lives longer (25 years vs 15 years).

Taxonomic Classification

Rank koala Polar bear
Kingdom same Animalia (動物) Animalia (動物)
Phylum same Chordata (脊索動物) Chordata (脊索動物)
Class same Mammalia (哺乳類) Mammalia (哺乳類)
Order Diprotodontia (カンガルー目) Carnivora (ネコ目)
Family Phascolarctidae (Koalas) Ursidae (Bears)
Genus Phascolarctos (Koalas) Ursus (Bears)
Species Phascolarctos cinereus Ursus maritimus

Evolutionary Relationship

koala and Polar bear share a common ancestor at the Class level: Mammalia. (哺乳類)

Conservation Status

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Polar bear

VU — Vulnerable

Population: ~26.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute koala Polar bear
Diet Herbivore Carnivore
Average Lifespan 15 years 25 years
Average Length 75 cm 2.4 m
Average Weight 10.0 kg 450.0 kg

Habitat & Geographic Range

koala

Habitat

Typically found in grasslands, forests, and vegetated habitats.

Range

Found in Australia. Currently classified as Vulnerable on the IUCN Red List, this species faces significant conservation challenges across its 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.

koala

オーストラリア東部・南東部を代表する有袋類で、体重は最大15kgに達し、低カロリーのユーカリの葉食から得るエネルギーを節約するために1日最大22時間を睡眠に費やす。他の哺乳類の多くを死に至らしめる有毒なユーカリ成分を処理するために高度に特化しており、解毒に特別に適応した腸内微生物叢を持つ。クラミジア感染症、生息地の伐採、気候変動により個体数が激減し、2022年に絶滅危惧種に指定された。

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。

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