Common Seal vs koala

Phoca vitulina compared with Phascolarctos cinereus

Key Differences

Common Seal is Near Threatened while koala is Vulnerable.
Common Seal is carnivore while koala is herbivore.
Common Seal is 8.0x heavier than koala.
Common Seal lives longer (30 years vs 15 years).

Taxonomic Classification

Rank	Common Seal	koala
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	Pinnipedia (Seals & Sea Lions)	Diprotodontia (カンガルー目)
Family	Phocidae (True Seals)	Phascolarctidae (Koalas)
Genus	Phoca (Harbor Seals)	Phascolarctos (Koalas)
Species	Phoca vitulina	Phascolarctos cinereus

Evolutionary Relationship

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

表示 Class: Mammalia

Conservation Status

Common Seal

NT — Near Threatened

Population: ~500.0K

Trend: Stable →

koala

VU — Vulnerable

Population: ~100.0K

Trend: Decreasing ↓

Physical Characteristics

Attribute	Common Seal	koala
Diet	Carnivore	Herbivore
Average Lifespan	30 years	15 years
Average Length	1.7 m	75 cm
Average Weight	80.0 kg	10.0 kg

Habitat & Geographic Range

Common Seal

Habitat

Typically found in diverse ecosystems where prey species are available.

Range

Found across Europe (7 countries) and North America (United States). Listed as Near Threatened, this species requires ongoing monitoring to prevent population decline.

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.

Common Seal

最も広く分布する鰭脚類であるゴマフアザラシの近縁種・ゼニガタアザラシ（Phoca vitulina）は、北大西洋と北太平洋の温帯・亜北極沿岸に生息する。成体は最大130kgに達し、海での魚・イカ・甲殻類の捕食と海岸や岩場での休息にほぼ同じ時間を費やす。大きく表情豊かな目は低照度での水中視覚に適応している。シャチ・サメ・ホッキョクグマにとって重要な食料源である。

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。